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Finding the Fourth Proportional to 31,338.80, 47,008.20 and 12,870.80

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Solution

The fourth proportional to 31,338.80, 47,008.20 and 12,870.80 is: 19,306.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,338.80 : 47,008.20 = 12,870.80 : x
  2. Step 2: Convert to fraction form
    31,338.80/47,008.20 = 12,870.80/x
  3. Step 3: Cross multiply
    31,338.80x = 47,008.20 × 12,870.80
  4. Step 4: Simplify right side
    31,338.80x = 605,033,140.56
  5. Step 5: Solve for x
    x = 605,033,140.56/31,338.80
  6. Step 6: Final answer
    x = 19,306.20

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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.