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Finding the Fourth Proportional to 28,684.80, 42,966.72 and 13,115.52

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Solution

The fourth proportional to 28,684.80, 42,966.72 and 13,115.52 is: 19,645.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,684.80 : 42,966.72 = 13,115.52 : x
  2. Step 2: Convert to fraction form
    28,684.80/42,966.72 = 13,115.52/x
  3. Step 3: Cross multiply
    28,684.80x = 42,966.72 × 13,115.52
  4. Step 4: Simplify right side
    28,684.80x = 563,530,875.49
  5. Step 5: Solve for x
    x = 563,530,875.49/28,684.80
  6. Step 6: Final answer
    x = 19,645.63

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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.