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Finding the Fourth Proportional to 58,665.71, 87,959.69 and 21,220.86

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Solution

The fourth proportional to 58,665.71, 87,959.69 and 21,220.86 is: 31,817.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,665.71 : 87,959.69 = 21,220.86 : x
  2. Step 2: Convert to fraction form
    58,665.71/87,959.69 = 21,220.86/x
  3. Step 3: Cross multiply
    58,665.71x = 87,959.69 × 21,220.86
  4. Step 4: Simplify right side
    58,665.71x = 1,866,580,267.13
  5. Step 5: Solve for x
    x = 1,866,580,267.13/58,665.71
  6. Step 6: Final answer
    x = 31,817.23

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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.