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Finding the Fourth Proportional to 72,123.68, 99,528.73 and 39,416.80

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Solution

The fourth proportional to 72,123.68, 99,528.73 and 39,416.80 is: 54,394.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,123.68 : 99,528.73 = 39,416.80 : x
  2. Step 2: Convert to fraction form
    72,123.68/99,528.73 = 39,416.80/x
  3. Step 3: Cross multiply
    72,123.68x = 99,528.73 × 39,416.80
  4. Step 4: Simplify right side
    72,123.68x = 3,923,104,044.66
  5. Step 5: Solve for x
    x = 3,923,104,044.66/72,123.68
  6. Step 6: Final answer
    x = 54,394.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.