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Finding the Fourth Proportional to 1,010.71, 1,515.89 and 280.36

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Solution

The fourth proportional to 1,010.71, 1,515.89 and 280.36 is: 420.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.71 : 1,515.89 = 280.36 : x
  2. Step 2: Convert to fraction form
    1,010.71/1,515.89 = 280.36/x
  3. Step 3: Cross multiply
    1,010.71x = 1,515.89 × 280.36
  4. Step 4: Simplify right side
    1,010.71x = 424,991.83
  5. Step 5: Solve for x
    x = 424,991.83/1,010.71
  6. Step 6: Final answer
    x = 420.49

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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.