Home / 28,290.52-39,042.30-15,715

Finding the Fourth Proportional to 28,290.52, 39,042.30 and 15,715

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Solution

The fourth proportional to 28,290.52, 39,042.30 and 15,715 is: 21,687.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,290.52 : 39,042.30 = 15,715 : x
  2. Step 2: Convert to fraction form
    28,290.52/39,042.30 = 15,715/x
  3. Step 3: Cross multiply
    28,290.52x = 39,042.30 × 15,715
  4. Step 4: Simplify right side
    28,290.52x = 613,549,744.50
  5. Step 5: Solve for x
    x = 613,549,744.50/28,290.52
  6. Step 6: Final answer
    x = 21,687.47

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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.