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Finding the Fourth Proportional to 61,691.81, 85,148.75 and 40,143.58

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Solution

The fourth proportional to 61,691.81, 85,148.75 and 40,143.58 is: 55,407.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,691.81 : 85,148.75 = 40,143.58 : x
  2. Step 2: Convert to fraction form
    61,691.81/85,148.75 = 40,143.58/x
  3. Step 3: Cross multiply
    61,691.81x = 85,148.75 × 40,143.58
  4. Step 4: Simplify right side
    61,691.81x = 3,418,175,031.06
  5. Step 5: Solve for x
    x = 3,418,175,031.06/61,691.81
  6. Step 6: Final answer
    x = 55,407.28

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1.5x scale

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.