Home / 21,225.60-29,291.88-12,729.11

Finding the Fourth Proportional to 21,225.60, 29,291.88 and 12,729.11

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Solution

The fourth proportional to 21,225.60, 29,291.88 and 12,729.11 is: 17,566.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,225.60 : 29,291.88 = 12,729.11 : x
  2. Step 2: Convert to fraction form
    21,225.60/29,291.88 = 12,729.11/x
  3. Step 3: Cross multiply
    21,225.60x = 29,291.88 × 12,729.11
  4. Step 4: Simplify right side
    21,225.60x = 372,859,416.17
  5. Step 5: Solve for x
    x = 372,859,416.17/21,225.60
  6. Step 6: Final answer
    x = 17,566.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.