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Finding the Fourth Proportional to 689,528.16, 951,635.52 and 387,720

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Solution

The fourth proportional to 689,528.16, 951,635.52 and 387,720 is: 535,102.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    689,528.16 : 951,635.52 = 387,720 : x
  2. Step 2: Convert to fraction form
    689,528.16/951,635.52 = 387,720/x
  3. Step 3: Cross multiply
    689,528.16x = 951,635.52 × 387,720
  4. Step 4: Simplify right side
    689,528.16x = 368,968,123,814.40
  5. Step 5: Solve for x
    x = 368,968,123,814.40/689,528.16
  6. Step 6: Final answer
    x = 535,102.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.