Home / 21,126.40-29,155.12-12,173.20

Finding the Fourth Proportional to 21,126.40, 29,155.12 and 12,173.20

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Solution

The fourth proportional to 21,126.40, 29,155.12 and 12,173.20 is: 16,799.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,126.40 : 29,155.12 = 12,173.20 : x
  2. Step 2: Convert to fraction form
    21,126.40/29,155.12 = 12,173.20/x
  3. Step 3: Cross multiply
    21,126.40x = 29,155.12 × 12,173.20
  4. Step 4: Simplify right side
    21,126.40x = 354,911,106.78
  5. Step 5: Solve for x
    x = 354,911,106.78/21,126.40
  6. Step 6: Final answer
    x = 16,799.41

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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.