Home / 13,121.32-18,107.28-7,152.86

Finding the Fourth Proportional to 13,121.32, 18,107.28 and 7,152.86

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Solution

The fourth proportional to 13,121.32, 18,107.28 and 7,152.86 is: 9,870.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.32 : 18,107.28 = 7,152.86 : x
  2. Step 2: Convert to fraction form
    13,121.32/18,107.28 = 7,152.86/x
  3. Step 3: Cross multiply
    13,121.32x = 18,107.28 × 7,152.86
  4. Step 4: Simplify right side
    13,121.32x = 129,518,838.82
  5. Step 5: Solve for x
    x = 129,518,838.82/13,121.32
  6. Step 6: Final answer
    x = 9,870.87

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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.