Home / 15,122.40-20,870.56-8,662.65

Finding the Fourth Proportional to 15,122.40, 20,870.56 and 8,662.65

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Solution

The fourth proportional to 15,122.40, 20,870.56 and 8,662.65 is: 11,955.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,122.40 : 20,870.56 = 8,662.65 : x
  2. Step 2: Convert to fraction form
    15,122.40/20,870.56 = 8,662.65/x
  3. Step 3: Cross multiply
    15,122.40x = 20,870.56 × 8,662.65
  4. Step 4: Simplify right side
    15,122.40x = 180,794,356.58
  5. Step 5: Solve for x
    x = 180,794,356.58/15,122.40
  6. Step 6: Final answer
    x = 11,955.40

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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.