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Finding the Fourth Proportional to 1,009.76, 1,515.16 and 432.48

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Solution

The fourth proportional to 1,009.76, 1,515.16 and 432.48 is: 648.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.76 : 1,515.16 = 432.48 : x
  2. Step 2: Convert to fraction form
    1,009.76/1,515.16 = 432.48/x
  3. Step 3: Cross multiply
    1,009.76x = 1,515.16 × 432.48
  4. Step 4: Simplify right side
    1,009.76x = 655,276.40
  5. Step 5: Solve for x
    x = 655,276.40/1,009.76
  6. Step 6: Final answer
    x = 648.94

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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.