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Finding the Fourth Proportional to 85,929.30, 128,529.45 and 77,108.40

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Solution

The fourth proportional to 85,929.30, 128,529.45 and 77,108.40 is: 115,335.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,929.30 : 128,529.45 = 77,108.40 : x
  2. Step 2: Convert to fraction form
    85,929.30/128,529.45 = 77,108.40/x
  3. Step 3: Cross multiply
    85,929.30x = 128,529.45 × 77,108.40
  4. Step 4: Simplify right side
    85,929.30x = 9,910,700,242.38
  5. Step 5: Solve for x
    x = 9,910,700,242.38/85,929.30
  6. Step 6: Final answer
    x = 115,335.52

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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.