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Finding the Fourth Proportional to 258,707.55, 387,964.53 and 90,184.62

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Solution

The fourth proportional to 258,707.55, 387,964.53 and 90,184.62 is: 135,243.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,707.55 : 387,964.53 = 90,184.62 : x
  2. Step 2: Convert to fraction form
    258,707.55/387,964.53 = 90,184.62/x
  3. Step 3: Cross multiply
    258,707.55x = 387,964.53 × 90,184.62
  4. Step 4: Simplify right side
    258,707.55x = 34,988,433,711.53
  5. Step 5: Solve for x
    x = 34,988,433,711.53/258,707.55
  6. Step 6: Final answer
    x = 135,243.19

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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.