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Finding the Fourth Proportional to 60,581.72, 90,866.09 and 21,139.58

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Solution

The fourth proportional to 60,581.72, 90,866.09 and 21,139.58 is: 31,707.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,581.72 : 90,866.09 = 21,139.58 : x
  2. Step 2: Convert to fraction form
    60,581.72/90,866.09 = 21,139.58/x
  3. Step 3: Cross multiply
    60,581.72x = 90,866.09 × 21,139.58
  4. Step 4: Simplify right side
    60,581.72x = 1,920,870,978.84
  5. Step 5: Solve for x
    x = 1,920,870,978.84/60,581.72
  6. Step 6: Final answer
    x = 31,707.11

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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.