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Finding the Fourth Proportional to 90,779.40, 136,169.10 and 82,031.40

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Solution

The fourth proportional to 90,779.40, 136,169.10 and 82,031.40 is: 123,047.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,779.40 : 136,169.10 = 82,031.40 : x
  2. Step 2: Convert to fraction form
    90,779.40/136,169.10 = 82,031.40/x
  3. Step 3: Cross multiply
    90,779.40x = 136,169.10 × 82,031.40
  4. Step 4: Simplify right side
    90,779.40x = 11,170,141,909.74
  5. Step 5: Solve for x
    x = 11,170,141,909.74/90,779.40
  6. Step 6: Final answer
    x = 123,047.10

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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.