Home / 12,389.70-18,575.28-7,458.18

Finding the Fourth Proportional to 12,389.70, 18,575.28 and 7,458.18

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Solution

The fourth proportional to 12,389.70, 18,575.28 and 7,458.18 is: 11,181.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,389.70 : 18,575.28 = 7,458.18 : x
  2. Step 2: Convert to fraction form
    12,389.70/18,575.28 = 7,458.18/x
  3. Step 3: Cross multiply
    12,389.70x = 18,575.28 × 7,458.18
  4. Step 4: Simplify right side
    12,389.70x = 138,537,781.79
  5. Step 5: Solve for x
    x = 138,537,781.79/12,389.70
  6. Step 6: Final answer
    x = 11,181.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.