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Finding the Fourth Proportional to 31,807.80, 47,711.70 and 8,436.60

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Solution

The fourth proportional to 31,807.80, 47,711.70 and 8,436.60 is: 12,654.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,807.80 : 47,711.70 = 8,436.60 : x
  2. Step 2: Convert to fraction form
    31,807.80/47,711.70 = 8,436.60/x
  3. Step 3: Cross multiply
    31,807.80x = 47,711.70 × 8,436.60
  4. Step 4: Simplify right side
    31,807.80x = 402,524,528.22
  5. Step 5: Solve for x
    x = 402,524,528.22/31,807.80
  6. Step 6: Final answer
    x = 12,654.90

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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.