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Finding the Fourth Proportional to 145,231.79, 217,884.64 and 85,310.93

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Solution

The fourth proportional to 145,231.79, 217,884.64 and 85,310.93 is: 127,988.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,231.79 : 217,884.64 = 85,310.93 : x
  2. Step 2: Convert to fraction form
    145,231.79/217,884.64 = 85,310.93/x
  3. Step 3: Cross multiply
    145,231.79x = 217,884.64 × 85,310.93
  4. Step 4: Simplify right side
    145,231.79x = 18,587,941,602.55
  5. Step 5: Solve for x
    x = 18,587,941,602.55/145,231.79
  6. Step 6: Final answer
    x = 127,988.11

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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.