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Finding the Fourth Proportional to 72,019.20, 108,028.80 and 54,278.40

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Solution

The fourth proportional to 72,019.20, 108,028.80 and 54,278.40 is: 81,417.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,019.20 : 108,028.80 = 54,278.40 : x
  2. Step 2: Convert to fraction form
    72,019.20/108,028.80 = 54,278.40/x
  3. Step 3: Cross multiply
    72,019.20x = 108,028.80 × 54,278.40
  4. Step 4: Simplify right side
    72,019.20x = 5,863,630,417.92
  5. Step 5: Solve for x
    x = 5,863,630,417.92/72,019.20
  6. Step 6: Final answer
    x = 81,417.60

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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.