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Finding the Fourth Proportional to 680,534.40, 939,128.24 and 378,728.40

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Solution

The fourth proportional to 680,534.40, 939,128.24 and 378,728.40 is: 522,640.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,534.40 : 939,128.24 = 378,728.40 : x
  2. Step 2: Convert to fraction form
    680,534.40/939,128.24 = 378,728.40/x
  3. Step 3: Cross multiply
    680,534.40x = 939,128.24 × 378,728.40
  4. Step 4: Simplify right side
    680,534.40x = 355,674,535,730.02
  5. Step 5: Solve for x
    x = 355,674,535,730.02/680,534.40
  6. Step 6: Final answer
    x = 522,640.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.