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Finding the Fourth Proportional to 1,009.28, 1,515.29 and 987.86

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Solution

The fourth proportional to 1,009.28, 1,515.29 and 987.86 is: 1,483.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.28 : 1,515.29 = 987.86 : x
  2. Step 2: Convert to fraction form
    1,009.28/1,515.29 = 987.86/x
  3. Step 3: Cross multiply
    1,009.28x = 1,515.29 × 987.86
  4. Step 4: Simplify right side
    1,009.28x = 1,496,881.86
  5. Step 5: Solve for x
    x = 1,496,881.86/1,009.28
  6. Step 6: Final answer
    x = 1,483.13

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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.