Home / 15,720.30-21,695.31-8,647.74

Finding the Fourth Proportional to 15,720.30, 21,695.31 and 8,647.74

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Solution

The fourth proportional to 15,720.30, 21,695.31 and 8,647.74 is: 11,934.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,720.30 : 21,695.31 = 8,647.74 : x
  2. Step 2: Convert to fraction form
    15,720.30/21,695.31 = 8,647.74/x
  3. Step 3: Cross multiply
    15,720.30x = 21,695.31 × 8,647.74
  4. Step 4: Simplify right side
    15,720.30x = 187,615,400.10
  5. Step 5: Solve for x
    x = 187,615,400.10/15,720.30
  6. Step 6: Final answer
    x = 11,934.59

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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.