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Finding the Fourth Proportional to 125,721.12, 173,404.64 and 85,364.80

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Solution

The fourth proportional to 125,721.12, 173,404.64 and 85,364.80 is: 117,741.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,721.12 : 173,404.64 = 85,364.80 : x
  2. Step 2: Convert to fraction form
    125,721.12/173,404.64 = 85,364.80/x
  3. Step 3: Cross multiply
    125,721.12x = 173,404.64 × 85,364.80
  4. Step 4: Simplify right side
    125,721.12x = 14,802,652,412.67
  5. Step 5: Solve for x
    x = 14,802,652,412.67/125,721.12
  6. Step 6: Final answer
    x = 117,741.97

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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.