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Finding the Fourth Proportional to 125,103.69, 172,643.13 and 71,389.89

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Solution

The fourth proportional to 125,103.69, 172,643.13 and 71,389.89 is: 98,518.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,103.69 : 172,643.13 = 71,389.89 : x
  2. Step 2: Convert to fraction form
    125,103.69/172,643.13 = 71,389.89/x
  3. Step 3: Cross multiply
    125,103.69x = 172,643.13 × 71,389.89
  4. Step 4: Simplify right side
    125,103.69x = 12,324,974,059.96
  5. Step 5: Solve for x
    x = 12,324,974,059.96/125,103.69
  6. Step 6: Final answer
    x = 98,518.07

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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.