Home / 20,543.31-28,349.76-11,111.85

Finding the Fourth Proportional to 20,543.31, 28,349.76 and 11,111.85

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Solution

The fourth proportional to 20,543.31, 28,349.76 and 11,111.85 is: 15,334.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,543.31 : 28,349.76 = 11,111.85 : x
  2. Step 2: Convert to fraction form
    20,543.31/28,349.76 = 11,111.85/x
  3. Step 3: Cross multiply
    20,543.31x = 28,349.76 × 11,111.85
  4. Step 4: Simplify right side
    20,543.31x = 315,018,280.66
  5. Step 5: Solve for x
    x = 315,018,280.66/20,543.31
  6. Step 6: Final answer
    x = 15,334.35

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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.