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Finding the Fourth Proportional to 21,822.60, 32,690.70 and 13,031.40

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Solution

The fourth proportional to 21,822.60, 32,690.70 and 13,031.40 is: 19,521.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,822.60 : 32,690.70 = 13,031.40 : x
  2. Step 2: Convert to fraction form
    21,822.60/32,690.70 = 13,031.40/x
  3. Step 3: Cross multiply
    21,822.60x = 32,690.70 × 13,031.40
  4. Step 4: Simplify right side
    21,822.60x = 426,005,587.98
  5. Step 5: Solve for x
    x = 426,005,587.98/21,822.60
  6. Step 6: Final answer
    x = 19,521.30

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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.