Home / 15,789.20-21,788.88-8,715.48

Finding the Fourth Proportional to 15,789.20, 21,788.88 and 8,715.48

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Solution

The fourth proportional to 15,789.20, 21,788.88 and 8,715.48 is: 12,027.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,789.20 : 21,788.88 = 8,715.48 : x
  2. Step 2: Convert to fraction form
    15,789.20/21,788.88 = 8,715.48/x
  3. Step 3: Cross multiply
    15,789.20x = 21,788.88 × 8,715.48
  4. Step 4: Simplify right side
    15,789.20x = 189,900,547.86
  5. Step 5: Solve for x
    x = 189,900,547.86/15,789.20
  6. Step 6: Final answer
    x = 12,027.24

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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.