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Finding the Fourth Proportional to 886,661.90, 1,330,320.90 and 287,642.60

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Solution

The fourth proportional to 886,661.90, 1,330,320.90 and 287,642.60 is: 431,570.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    886,661.90 : 1,330,320.90 = 287,642.60 : x
  2. Step 2: Convert to fraction form
    886,661.90/1,330,320.90 = 287,642.60/x
  3. Step 3: Cross multiply
    886,661.90x = 1,330,320.90 × 287,642.60
  4. Step 4: Simplify right side
    886,661.90x = 382,656,962,510.34
  5. Step 5: Solve for x
    x = 382,656,962,510.34/886,661.90
  6. Step 6: Final answer
    x = 431,570.32

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.