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Finding the Fourth Proportional to 860.49, 1,290.74 and 587.25

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Solution

The fourth proportional to 860.49, 1,290.74 and 587.25 is: 880.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.49 : 1,290.74 = 587.25 : x
  2. Step 2: Convert to fraction form
    860.49/1,290.74 = 587.25/x
  3. Step 3: Cross multiply
    860.49x = 1,290.74 × 587.25
  4. Step 4: Simplify right side
    860.49x = 757,984.13
  5. Step 5: Solve for x
    x = 757,984.13/860.49
  6. Step 6: Final answer
    x = 880.88

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Double scale
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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.