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Finding the Fourth Proportional to 91,001.70, 136,502.55 and 86,919.30

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Solution

The fourth proportional to 91,001.70, 136,502.55 and 86,919.30 is: 130,378.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,001.70 : 136,502.55 = 86,919.30 : x
  2. Step 2: Convert to fraction form
    91,001.70/136,502.55 = 86,919.30/x
  3. Step 3: Cross multiply
    91,001.70x = 136,502.55 × 86,919.30
  4. Step 4: Simplify right side
    91,001.70x = 11,864,706,094.22
  5. Step 5: Solve for x
    x = 11,864,706,094.22/91,001.70
  6. Step 6: Final answer
    x = 130,378.95

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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.