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Finding the Fourth Proportional to 72,421.86, 108,615.78 and 21,810.90

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Solution

The fourth proportional to 72,421.86, 108,615.78 and 21,810.90 is: 32,711.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,421.86 : 108,615.78 = 21,810.90 : x
  2. Step 2: Convert to fraction form
    72,421.86/108,615.78 = 21,810.90/x
  3. Step 3: Cross multiply
    72,421.86x = 108,615.78 × 21,810.90
  4. Step 4: Simplify right side
    72,421.86x = 2,369,007,916.00
  5. Step 5: Solve for x
    x = 2,369,007,916.00/72,421.86
  6. Step 6: Final answer
    x = 32,711.23

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1.5x scale

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.