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Finding the Fourth Proportional to 53,877.20, 80,815.80 and 21,045.20

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Solution

The fourth proportional to 53,877.20, 80,815.80 and 21,045.20 is: 31,567.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,877.20 : 80,815.80 = 21,045.20 : x
  2. Step 2: Convert to fraction form
    53,877.20/80,815.80 = 21,045.20/x
  3. Step 3: Cross multiply
    53,877.20x = 80,815.80 × 21,045.20
  4. Step 4: Simplify right side
    53,877.20x = 1,700,784,674.16
  5. Step 5: Solve for x
    x = 1,700,784,674.16/53,877.20
  6. Step 6: Final answer
    x = 31,567.80

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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.