Home / 20,862.42-28,789.98-11,430.78

Finding the Fourth Proportional to 20,862.42, 28,789.98 and 11,430.78

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Solution

The fourth proportional to 20,862.42, 28,789.98 and 11,430.78 is: 15,774.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,862.42 : 28,789.98 = 11,430.78 : x
  2. Step 2: Convert to fraction form
    20,862.42/28,789.98 = 11,430.78/x
  3. Step 3: Cross multiply
    20,862.42x = 28,789.98 × 11,430.78
  4. Step 4: Simplify right side
    20,862.42x = 329,091,927.58
  5. Step 5: Solve for x
    x = 329,091,927.58/20,862.42
  6. Step 6: Final answer
    x = 15,774.39

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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.