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Finding the Fourth Proportional to 85,432.86, 128,101.30 and 35,479.36

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Solution

The fourth proportional to 85,432.86, 128,101.30 and 35,479.36 is: 53,199.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,432.86 : 128,101.30 = 35,479.36 : x
  2. Step 2: Convert to fraction form
    85,432.86/128,101.30 = 35,479.36/x
  3. Step 3: Cross multiply
    85,432.86x = 128,101.30 × 35,479.36
  4. Step 4: Simplify right side
    85,432.86x = 4,544,952,139.17
  5. Step 5: Solve for x
    x = 4,544,952,139.17/85,432.86
  6. Step 6: Final answer
    x = 53,199.11

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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.