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Finding the Fourth Proportional to 71,988, 99,343.53 and 40,158.93

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Solution

The fourth proportional to 71,988, 99,343.53 and 40,158.93 is: 55,419.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,988 : 99,343.53 = 40,158.93 : x
  2. Step 2: Convert to fraction form
    71,988/99,343.53 = 40,158.93/x
  3. Step 3: Cross multiply
    71,988x = 99,343.53 × 40,158.93
  4. Step 4: Simplify right side
    71,988x = 3,989,529,867.22
  5. Step 5: Solve for x
    x = 3,989,529,867.22/71,988
  6. Step 6: Final answer
    x = 55,419.37

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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.