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Finding the Fourth Proportional to 85,609.64, 128,262.08 and 73,001.75

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Solution

The fourth proportional to 85,609.64, 128,262.08 and 73,001.75 is: 109,372.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,609.64 : 128,262.08 = 73,001.75 : x
  2. Step 2: Convert to fraction form
    85,609.64/128,262.08 = 73,001.75/x
  3. Step 3: Cross multiply
    85,609.64x = 128,262.08 × 73,001.75
  4. Step 4: Simplify right side
    85,609.64x = 9,363,356,320.82
  5. Step 5: Solve for x
    x = 9,363,356,320.82/85,609.64
  6. Step 6: Final answer
    x = 109,372.69

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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.