Home / 12,139.60-18,212.10-4,743.40

Finding the Fourth Proportional to 12,139.60, 18,212.10 and 4,743.40

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Solution

The fourth proportional to 12,139.60, 18,212.10 and 4,743.40 is: 7,116.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,139.60 : 18,212.10 = 4,743.40 : x
  2. Step 2: Convert to fraction form
    12,139.60/18,212.10 = 4,743.40/x
  3. Step 3: Cross multiply
    12,139.60x = 18,212.10 × 4,743.40
  4. Step 4: Simplify right side
    12,139.60x = 86,387,275.14
  5. Step 5: Solve for x
    x = 86,387,275.14/12,139.60
  6. Step 6: Final answer
    x = 7,116.15

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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.