Home / 20,719.95-31,079.69-12,402.29

Finding the Fourth Proportional to 20,719.95, 31,079.69 and 12,402.29

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Solution

The fourth proportional to 20,719.95, 31,079.69 and 12,402.29 is: 18,603.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,719.95 : 31,079.69 = 12,402.29 : x
  2. Step 2: Convert to fraction form
    20,719.95/31,079.69 = 12,402.29/x
  3. Step 3: Cross multiply
    20,719.95x = 31,079.69 × 12,402.29
  4. Step 4: Simplify right side
    20,719.95x = 385,459,244.86
  5. Step 5: Solve for x
    x = 385,459,244.86/20,719.95
  6. Step 6: Final answer
    x = 18,603.29

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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.