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Finding the Fourth Proportional to 125,064.42, 172,619.28 and 77,289

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Solution

The fourth proportional to 125,064.42, 172,619.28 and 77,289 is: 106,677.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,064.42 : 172,619.28 = 77,289 : x
  2. Step 2: Convert to fraction form
    125,064.42/172,619.28 = 77,289/x
  3. Step 3: Cross multiply
    125,064.42x = 172,619.28 × 77,289
  4. Step 4: Simplify right side
    125,064.42x = 13,341,571,531.92
  5. Step 5: Solve for x
    x = 13,341,571,531.92/125,064.42
  6. Step 6: Final answer
    x = 106,677.59

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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.