Home / 21,280.28-29,353.88-13,315.96

Finding the Fourth Proportional to 21,280.28, 29,353.88 and 13,315.96

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Solution

The fourth proportional to 21,280.28, 29,353.88 and 13,315.96 is: 18,367.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,280.28 : 29,353.88 = 13,315.96 : x
  2. Step 2: Convert to fraction form
    21,280.28/29,353.88 = 13,315.96/x
  3. Step 3: Cross multiply
    21,280.28x = 29,353.88 × 13,315.96
  4. Step 4: Simplify right side
    21,280.28x = 390,875,091.92
  5. Step 5: Solve for x
    x = 390,875,091.92/21,280.28
  6. Step 6: Final answer
    x = 18,367.95

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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.