Home / 13,218.75-18,242.60-7,631.55

Finding the Fourth Proportional to 13,218.75, 18,242.60 and 7,631.55

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Solution

The fourth proportional to 13,218.75, 18,242.60 and 7,631.55 is: 10,531.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,218.75 : 18,242.60 = 7,631.55 : x
  2. Step 2: Convert to fraction form
    13,218.75/18,242.60 = 7,631.55/x
  3. Step 3: Cross multiply
    13,218.75x = 18,242.60 × 7,631.55
  4. Step 4: Simplify right side
    13,218.75x = 139,219,275.87
  5. Step 5: Solve for x
    x = 139,219,275.87/13,218.75
  6. Step 6: Final answer
    x = 10,531.95

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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.