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Finding the Fourth Proportional to 70,611.17, 105,916.73 and 20,691.25

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Solution

The fourth proportional to 70,611.17, 105,916.73 and 20,691.25 is: 31,036.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,611.17 : 105,916.73 = 20,691.25 : x
  2. Step 2: Convert to fraction form
    70,611.17/105,916.73 = 20,691.25/x
  3. Step 3: Cross multiply
    70,611.17x = 105,916.73 × 20,691.25
  4. Step 4: Simplify right side
    70,611.17x = 2,191,549,171.36
  5. Step 5: Solve for x
    x = 2,191,549,171.36/70,611.17
  6. Step 6: Final answer
    x = 31,036.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.