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Finding the Fourth Proportional to 91,316, 136,974.04 and 28,986.50

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Solution

The fourth proportional to 91,316, 136,974.04 and 28,986.50 is: 43,479.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,316 : 136,974.04 = 28,986.50 : x
  2. Step 2: Convert to fraction form
    91,316/136,974.04 = 28,986.50/x
  3. Step 3: Cross multiply
    91,316x = 136,974.04 × 28,986.50
  4. Step 4: Simplify right side
    91,316x = 3,970,398,010.46
  5. Step 5: Solve for x
    x = 3,970,398,010.46/91,316
  6. Step 6: Final answer
    x = 43,479.76

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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.