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Finding the Fourth Proportional to 86,312.42, 129,225.15 and 45,693.89

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Solution

The fourth proportional to 86,312.42, 129,225.15 and 45,693.89 is: 68,411.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,312.42 : 129,225.15 = 45,693.89 : x
  2. Step 2: Convert to fraction form
    86,312.42/129,225.15 = 45,693.89/x
  3. Step 3: Cross multiply
    86,312.42x = 129,225.15 × 45,693.89
  4. Step 4: Simplify right side
    86,312.42x = 5,904,799,143.21
  5. Step 5: Solve for x
    x = 5,904,799,143.21/86,312.42
  6. Step 6: Final answer
    x = 68,411.93

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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.