Home / 28,356.05-39,132.65-15,781.61

Finding the Fourth Proportional to 28,356.05, 39,132.65 and 15,781.61

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Solution

The fourth proportional to 28,356.05, 39,132.65 and 15,781.61 is: 21,779.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,356.05 : 39,132.65 = 15,781.61 : x
  2. Step 2: Convert to fraction form
    28,356.05/39,132.65 = 15,781.61/x
  3. Step 3: Cross multiply
    28,356.05x = 39,132.65 × 15,781.61
  4. Step 4: Simplify right side
    28,356.05x = 617,576,141.66
  5. Step 5: Solve for x
    x = 617,576,141.66/28,356.05
  6. Step 6: Final answer
    x = 21,779.34

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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.