Home / 21,132.28-29,155.95-12,178.57

Finding the Fourth Proportional to 21,132.28, 29,155.95 and 12,178.57

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Solution

The fourth proportional to 21,132.28, 29,155.95 and 12,178.57 is: 16,802.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,132.28 : 29,155.95 = 12,178.57 : x
  2. Step 2: Convert to fraction form
    21,132.28/29,155.95 = 12,178.57/x
  3. Step 3: Cross multiply
    21,132.28x = 29,155.95 × 12,178.57
  4. Step 4: Simplify right side
    21,132.28x = 355,077,759.77
  5. Step 5: Solve for x
    x = 355,077,759.77/21,132.28
  6. Step 6: Final answer
    x = 16,802.62

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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.