Home / 31,987.40-47,981.10-11,208.20

Finding the Fourth Proportional to 31,987.40, 47,981.10 and 11,208.20

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Solution

The fourth proportional to 31,987.40, 47,981.10 and 11,208.20 is: 16,812.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,987.40 : 47,981.10 = 11,208.20 : x
  2. Step 2: Convert to fraction form
    31,987.40/47,981.10 = 11,208.20/x
  3. Step 3: Cross multiply
    31,987.40x = 47,981.10 × 11,208.20
  4. Step 4: Simplify right side
    31,987.40x = 537,781,765.02
  5. Step 5: Solve for x
    x = 537,781,765.02/31,987.40
  6. Step 6: Final answer
    x = 16,812.30

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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.