Home / 15,815.18-21,780.51-15,470.72

Finding the Fourth Proportional to 15,815.18, 21,780.51 and 15,470.72

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Solution

The fourth proportional to 15,815.18, 21,780.51 and 15,470.72 is: 21,306.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,815.18 : 21,780.51 = 15,470.72 : x
  2. Step 2: Convert to fraction form
    15,815.18/21,780.51 = 15,470.72/x
  3. Step 3: Cross multiply
    15,815.18x = 21,780.51 × 15,470.72
  4. Step 4: Simplify right side
    15,815.18x = 336,960,171.67
  5. Step 5: Solve for x
    x = 336,960,171.67/15,815.18
  6. Step 6: Final answer
    x = 21,306.12

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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.