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Finding the Fourth Proportional to 85,590.78, 128,337.57 and 71,637.72

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Solution

The fourth proportional to 85,590.78, 128,337.57 and 71,637.72 is: 107,415.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,590.78 : 128,337.57 = 71,637.72 : x
  2. Step 2: Convert to fraction form
    85,590.78/128,337.57 = 71,637.72/x
  3. Step 3: Cross multiply
    85,590.78x = 128,337.57 × 71,637.72
  4. Step 4: Simplify right side
    85,590.78x = 9,193,810,905.14
  5. Step 5: Solve for x
    x = 9,193,810,905.14/85,590.78
  6. Step 6: Final answer
    x = 107,415.90

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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.