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Finding the Fourth Proportional to 72,904.80, 109,472.40 and 53,320.80

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Solution

The fourth proportional to 72,904.80, 109,472.40 and 53,320.80 is: 80,065.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,904.80 : 109,472.40 = 53,320.80 : x
  2. Step 2: Convert to fraction form
    72,904.80/109,472.40 = 53,320.80/x
  3. Step 3: Cross multiply
    72,904.80x = 109,472.40 × 53,320.80
  4. Step 4: Simplify right side
    72,904.80x = 5,837,155,945.92
  5. Step 5: Solve for x
    x = 5,837,155,945.92/72,904.80
  6. Step 6: Final answer
    x = 80,065.45

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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.