Home / 13,316.11-18,378.61-7,938.90

Finding the Fourth Proportional to 13,316.11, 18,378.61 and 7,938.90

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Solution

The fourth proportional to 13,316.11, 18,378.61 and 7,938.90 is: 10,957.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,316.11 : 18,378.61 = 7,938.90 : x
  2. Step 2: Convert to fraction form
    13,316.11/18,378.61 = 7,938.90/x
  3. Step 3: Cross multiply
    13,316.11x = 18,378.61 × 7,938.90
  4. Step 4: Simplify right side
    13,316.11x = 145,905,946.93
  5. Step 5: Solve for x
    x = 145,905,946.93/13,316.11
  6. Step 6: Final answer
    x = 10,957.10

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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.