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Finding the Fourth Proportional to 99,062.45, 136,706.17 and 56,621.89

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Solution

The fourth proportional to 99,062.45, 136,706.17 and 56,621.89 is: 78,138.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,062.45 : 136,706.17 = 56,621.89 : x
  2. Step 2: Convert to fraction form
    99,062.45/136,706.17 = 56,621.89/x
  3. Step 3: Cross multiply
    99,062.45x = 136,706.17 × 56,621.89
  4. Step 4: Simplify right side
    99,062.45x = 7,740,561,449.07
  5. Step 5: Solve for x
    x = 7,740,561,449.07/99,062.45
  6. Step 6: Final answer
    x = 78,138.20

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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.