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Finding the Fourth Proportional to 125,315.31, 172,919.13 and 71,603.81

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Solution

The fourth proportional to 125,315.31, 172,919.13 and 71,603.81 is: 98,804.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,315.31 : 172,919.13 = 71,603.81 : x
  2. Step 2: Convert to fraction form
    125,315.31/172,919.13 = 71,603.81/x
  3. Step 3: Cross multiply
    125,315.31x = 172,919.13 × 71,603.81
  4. Step 4: Simplify right side
    125,315.31x = 12,381,667,665.29
  5. Step 5: Solve for x
    x = 12,381,667,665.29/125,315.31
  6. Step 6: Final answer
    x = 98,804.11

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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.