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Finding the Fourth Proportional to 31,343.40, 47,015.10 and 18,901.80

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Solution

The fourth proportional to 31,343.40, 47,015.10 and 18,901.80 is: 28,352.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,343.40 : 47,015.10 = 18,901.80 : x
  2. Step 2: Convert to fraction form
    31,343.40/47,015.10 = 18,901.80/x
  3. Step 3: Cross multiply
    31,343.40x = 47,015.10 × 18,901.80
  4. Step 4: Simplify right side
    31,343.40x = 888,670,017.18
  5. Step 5: Solve for x
    x = 888,670,017.18/31,343.40
  6. Step 6: Final answer
    x = 28,352.70

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Similar ratio
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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.