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Finding the Fourth Proportional to 28,642.60, 42,979.56 and 11,113.12

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Solution

The fourth proportional to 28,642.60, 42,979.56 and 11,113.12 is: 16,675.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,642.60 : 42,979.56 = 11,113.12 : x
  2. Step 2: Convert to fraction form
    28,642.60/42,979.56 = 11,113.12/x
  3. Step 3: Cross multiply
    28,642.60x = 42,979.56 × 11,113.12
  4. Step 4: Simplify right side
    28,642.60x = 477,637,007.83
  5. Step 5: Solve for x
    x = 477,637,007.83/28,642.60
  6. Step 6: Final answer
    x = 16,675.76

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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.