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Finding the Fourth Proportional to 56,728.80, 85,068.09 and 21,643.92

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Solution

The fourth proportional to 56,728.80, 85,068.09 and 21,643.92 is: 32,456.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,728.80 : 85,068.09 = 21,643.92 : x
  2. Step 2: Convert to fraction form
    56,728.80/85,068.09 = 21,643.92/x
  3. Step 3: Cross multiply
    56,728.80x = 85,068.09 × 21,643.92
  4. Step 4: Simplify right side
    56,728.80x = 1,841,206,934.51
  5. Step 5: Solve for x
    x = 1,841,206,934.51/56,728.80
  6. Step 6: Final answer
    x = 32,456.30

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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.