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Finding the Fourth Proportional to 21,090.40, 31,712.40 and 17,711.20

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Solution

The fourth proportional to 21,090.40, 31,712.40 and 17,711.20 is: 26,631.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,090.40 : 31,712.40 = 17,711.20 : x
  2. Step 2: Convert to fraction form
    21,090.40/31,712.40 = 17,711.20/x
  3. Step 3: Cross multiply
    21,090.40x = 31,712.40 × 17,711.20
  4. Step 4: Simplify right side
    21,090.40x = 561,664,658.88
  5. Step 5: Solve for x
    x = 561,664,658.88/21,090.40
  6. Step 6: Final answer
    x = 26,631.29

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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.