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Finding the Fourth Proportional to 72,904.80, 109,357.20 and 45,218.40

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Solution

The fourth proportional to 72,904.80, 109,357.20 and 45,218.40 is: 67,827.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,904.80 : 109,357.20 = 45,218.40 : x
  2. Step 2: Convert to fraction form
    72,904.80/109,357.20 = 45,218.40/x
  3. Step 3: Cross multiply
    72,904.80x = 109,357.20 × 45,218.40
  4. Step 4: Simplify right side
    72,904.80x = 4,944,957,612.48
  5. Step 5: Solve for x
    x = 4,944,957,612.48/72,904.80
  6. Step 6: Final answer
    x = 67,827.60

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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.