Home / 20,742.47-28,623.66-12,689.53

Finding the Fourth Proportional to 20,742.47, 28,623.66 and 12,689.53

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Solution

The fourth proportional to 20,742.47, 28,623.66 and 12,689.53 is: 17,510.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,742.47 : 28,623.66 = 12,689.53 : x
  2. Step 2: Convert to fraction form
    20,742.47/28,623.66 = 12,689.53/x
  3. Step 3: Cross multiply
    20,742.47x = 28,623.66 × 12,689.53
  4. Step 4: Simplify right side
    20,742.47x = 363,220,649.16
  5. Step 5: Solve for x
    x = 363,220,649.16/20,742.47
  6. Step 6: Final answer
    x = 17,510.96

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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.