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Finding the Fourth Proportional to 85,853.10, 128,779.65 and 72,893.10

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Solution

The fourth proportional to 85,853.10, 128,779.65 and 72,893.10 is: 109,339.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,853.10 : 128,779.65 = 72,893.10 : x
  2. Step 2: Convert to fraction form
    85,853.10/128,779.65 = 72,893.10/x
  3. Step 3: Cross multiply
    85,853.10x = 128,779.65 × 72,893.10
  4. Step 4: Simplify right side
    85,853.10x = 9,387,147,905.42
  5. Step 5: Solve for x
    x = 9,387,147,905.42/85,853.10
  6. Step 6: Final answer
    x = 109,339.65

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Similar ratio
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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.