Home / 78,405.96-117,621-25,803.12

Finding the Fourth Proportional to 78,405.96, 117,621 and 25,803.12

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Solution

The fourth proportional to 78,405.96, 117,621 and 25,803.12 is: 38,708.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,405.96 : 117,621 = 25,803.12 : x
  2. Step 2: Convert to fraction form
    78,405.96/117,621 = 25,803.12/x
  3. Step 3: Cross multiply
    78,405.96x = 117,621 × 25,803.12
  4. Step 4: Simplify right side
    78,405.96x = 3,034,988,777.52
  5. Step 5: Solve for x
    x = 3,034,988,777.52/78,405.96
  6. Step 6: Final answer
    x = 38,708.65

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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.