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Finding the Fourth Proportional to 258,479.11, 387,718.80 and 81,000.01

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Solution

The fourth proportional to 258,479.11, 387,718.80 and 81,000.01 is: 121,500.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,479.11 : 387,718.80 = 81,000.01 : x
  2. Step 2: Convert to fraction form
    258,479.11/387,718.80 = 81,000.01/x
  3. Step 3: Cross multiply
    258,479.11x = 387,718.80 × 81,000.01
  4. Step 4: Simplify right side
    258,479.11x = 31,405,226,677.19
  5. Step 5: Solve for x
    x = 31,405,226,677.19/258,479.11
  6. Step 6: Final answer
    x = 121,500.06

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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.