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Finding the Fourth Proportional to 90,779.60, 136,169.40 and 86,405.60

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Solution

The fourth proportional to 90,779.60, 136,169.40 and 86,405.60 is: 129,608.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,779.60 : 136,169.40 = 86,405.60 : x
  2. Step 2: Convert to fraction form
    90,779.60/136,169.40 = 86,405.60/x
  3. Step 3: Cross multiply
    90,779.60x = 136,169.40 × 86,405.60
  4. Step 4: Simplify right side
    90,779.60x = 11,765,798,708.64
  5. Step 5: Solve for x
    x = 11,765,798,708.64/90,779.60
  6. Step 6: Final answer
    x = 129,608.40

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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.