Home / 90,779.20-136,168.80-28,449.60

Finding the Fourth Proportional to 90,779.20, 136,168.80 and 28,449.60

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Solution

The fourth proportional to 90,779.20, 136,168.80 and 28,449.60 is: 42,674.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,779.20 : 136,168.80 = 28,449.60 : x
  2. Step 2: Convert to fraction form
    90,779.20/136,168.80 = 28,449.60/x
  3. Step 3: Cross multiply
    90,779.20x = 136,168.80 × 28,449.60
  4. Step 4: Simplify right side
    90,779.20x = 3,873,947,892.48
  5. Step 5: Solve for x
    x = 3,873,947,892.48/90,779.20
  6. Step 6: Final answer
    x = 42,674.40

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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.