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Finding the Fourth Proportional to 125,317.83, 172,911.51 and 79,390.83

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Solution

The fourth proportional to 125,317.83, 172,911.51 and 79,390.83 is: 109,542.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,317.83 : 172,911.51 = 79,390.83 : x
  2. Step 2: Convert to fraction form
    125,317.83/172,911.51 = 79,390.83/x
  3. Step 3: Cross multiply
    125,317.83x = 172,911.51 × 79,390.83
  4. Step 4: Simplify right side
    125,317.83x = 13,727,588,943.87
  5. Step 5: Solve for x
    x = 13,727,588,943.87/125,317.83
  6. Step 6: Final answer
    x = 109,542.18

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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.