Home / 78,154.32-117,229.80-18,990.30

Finding the Fourth Proportional to 78,154.32, 117,229.80 and 18,990.30

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Solution

The fourth proportional to 78,154.32, 117,229.80 and 18,990.30 is: 28,485.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,154.32 : 117,229.80 = 18,990.30 : x
  2. Step 2: Convert to fraction form
    78,154.32/117,229.80 = 18,990.30/x
  3. Step 3: Cross multiply
    78,154.32x = 117,229.80 × 18,990.30
  4. Step 4: Simplify right side
    78,154.32x = 2,226,229,070.94
  5. Step 5: Solve for x
    x = 2,226,229,070.94/78,154.32
  6. Step 6: Final answer
    x = 28,485.04

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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.