Home / 13,145.31-18,138.20-7,479.16

Finding the Fourth Proportional to 13,145.31, 18,138.20 and 7,479.16

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Solution

The fourth proportional to 13,145.31, 18,138.20 and 7,479.16 is: 10,319.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,145.31 : 18,138.20 = 7,479.16 : x
  2. Step 2: Convert to fraction form
    13,145.31/18,138.20 = 7,479.16/x
  3. Step 3: Cross multiply
    13,145.31x = 18,138.20 × 7,479.16
  4. Step 4: Simplify right side
    13,145.31x = 135,658,417.17
  5. Step 5: Solve for x
    x = 135,658,417.17/13,145.31
  6. Step 6: Final answer
    x = 10,319.91

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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.