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Finding the Fourth Proportional to 72,478.80, 108,718.20 and 47,530.80

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Solution

The fourth proportional to 72,478.80, 108,718.20 and 47,530.80 is: 71,296.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,478.80 : 108,718.20 = 47,530.80 : x
  2. Step 2: Convert to fraction form
    72,478.80/108,718.20 = 47,530.80/x
  3. Step 3: Cross multiply
    72,478.80x = 108,718.20 × 47,530.80
  4. Step 4: Simplify right side
    72,478.80x = 5,167,463,020.56
  5. Step 5: Solve for x
    x = 5,167,463,020.56/72,478.80
  6. Step 6: Final answer
    x = 71,296.20

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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.