Home / 12,905.61-17,815.20-8,719.53

Finding the Fourth Proportional to 12,905.61, 17,815.20 and 8,719.53

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Solution

The fourth proportional to 12,905.61, 17,815.20 and 8,719.53 is: 12,036.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,905.61 : 17,815.20 = 8,719.53 : x
  2. Step 2: Convert to fraction form
    12,905.61/17,815.20 = 8,719.53/x
  3. Step 3: Cross multiply
    12,905.61x = 17,815.20 × 8,719.53
  4. Step 4: Simplify right side
    12,905.61x = 155,340,170.86
  5. Step 5: Solve for x
    x = 155,340,170.86/12,905.61
  6. Step 6: Final answer
    x = 12,036.64

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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.