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Finding the Fourth Proportional to 31,903.40, 47,855.10 and 8,210.90

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Solution

The fourth proportional to 31,903.40, 47,855.10 and 8,210.90 is: 12,316.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,903.40 : 47,855.10 = 8,210.90 : x
  2. Step 2: Convert to fraction form
    31,903.40/47,855.10 = 8,210.90/x
  3. Step 3: Cross multiply
    31,903.40x = 47,855.10 × 8,210.90
  4. Step 4: Simplify right side
    31,903.40x = 392,933,440.59
  5. Step 5: Solve for x
    x = 392,933,440.59/31,903.40
  6. Step 6: Final answer
    x = 12,316.35

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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.