Home / 21,005.40-31,508.10-17,311.80

Finding the Fourth Proportional to 21,005.40, 31,508.10 and 17,311.80

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Solution

The fourth proportional to 21,005.40, 31,508.10 and 17,311.80 is: 25,967.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.40 : 31,508.10 = 17,311.80 : x
  2. Step 2: Convert to fraction form
    21,005.40/31,508.10 = 17,311.80/x
  3. Step 3: Cross multiply
    21,005.40x = 31,508.10 × 17,311.80
  4. Step 4: Simplify right side
    21,005.40x = 545,461,925.58
  5. Step 5: Solve for x
    x = 545,461,925.58/21,005.40
  6. Step 6: Final answer
    x = 25,967.70

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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.