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Finding the Fourth Proportional to 28,667.16, 42,978.42 and 13,666.56

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Solution

The fourth proportional to 28,667.16, 42,978.42 and 13,666.56 is: 20,489.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,667.16 : 42,978.42 = 13,666.56 : x
  2. Step 2: Convert to fraction form
    28,667.16/42,978.42 = 13,666.56/x
  3. Step 3: Cross multiply
    28,667.16x = 42,978.42 × 13,666.56
  4. Step 4: Simplify right side
    28,667.16x = 587,367,155.64
  5. Step 5: Solve for x
    x = 587,367,155.64/28,667.16
  6. Step 6: Final answer
    x = 20,489.20

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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.