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Finding the Fourth Proportional to 1,009.76, 1,515.30 and 432.76

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Solution

The fourth proportional to 1,009.76, 1,515.30 and 432.76 is: 649.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.76 : 1,515.30 = 432.76 : x
  2. Step 2: Convert to fraction form
    1,009.76/1,515.30 = 432.76/x
  3. Step 3: Cross multiply
    1,009.76x = 1,515.30 × 432.76
  4. Step 4: Simplify right side
    1,009.76x = 655,761.23
  5. Step 5: Solve for x
    x = 655,761.23/1,009.76
  6. Step 6: Final answer
    x = 649.42

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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.