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Finding the Fourth Proportional to 48,685.20, 72,970.20 and 20,605.20

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Solution

The fourth proportional to 48,685.20, 72,970.20 and 20,605.20 is: 30,883.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    48,685.20 : 72,970.20 = 20,605.20 : x
  2. Step 2: Convert to fraction form
    48,685.20/72,970.20 = 20,605.20/x
  3. Step 3: Cross multiply
    48,685.20x = 72,970.20 × 20,605.20
  4. Step 4: Simplify right side
    48,685.20x = 1,503,565,565.04
  5. Step 5: Solve for x
    x = 1,503,565,565.04/48,685.20
  6. Step 6: Final answer
    x = 30,883.42

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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.