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Finding the Fourth Proportional to 13,390.88, 18,479.04 and 7,422.40

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Solution

The fourth proportional to 13,390.88, 18,479.04 and 7,422.40 is: 10,242.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,390.88 : 18,479.04 = 7,422.40 : x
  2. Step 2: Convert to fraction form
    13,390.88/18,479.04 = 7,422.40/x
  3. Step 3: Cross multiply
    13,390.88x = 18,479.04 × 7,422.40
  4. Step 4: Simplify right side
    13,390.88x = 137,158,826.50
  5. Step 5: Solve for x
    x = 137,158,826.50/13,390.88
  6. Step 6: Final answer
    x = 10,242.70

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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.