Home / 15,122.24-20,870.12-9,155.40

Finding the Fourth Proportional to 15,122.24, 20,870.12 and 9,155.40

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Solution

The fourth proportional to 15,122.24, 20,870.12 and 9,155.40 is: 12,635.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,122.24 : 20,870.12 = 9,155.40 : x
  2. Step 2: Convert to fraction form
    15,122.24/20,870.12 = 9,155.40/x
  3. Step 3: Cross multiply
    15,122.24x = 20,870.12 × 9,155.40
  4. Step 4: Simplify right side
    15,122.24x = 191,074,296.65
  5. Step 5: Solve for x
    x = 191,074,296.65/15,122.24
  6. Step 6: Final answer
    x = 12,635.32

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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.