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Finding the Fourth Proportional to 1,010.32, 1,515.47 and 279.89

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Solution

The fourth proportional to 1,010.32, 1,515.47 and 279.89 is: 419.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.32 : 1,515.47 = 279.89 : x
  2. Step 2: Convert to fraction form
    1,010.32/1,515.47 = 279.89/x
  3. Step 3: Cross multiply
    1,010.32x = 1,515.47 × 279.89
  4. Step 4: Simplify right side
    1,010.32x = 424,155.92
  5. Step 5: Solve for x
    x = 424,155.92/1,010.32
  6. Step 6: Final answer
    x = 419.83

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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.