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Finding the Fourth Proportional to 100,918.20, 151,247.70 and 77,428.20

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Solution

The fourth proportional to 100,918.20, 151,247.70 and 77,428.20 is: 116,042.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,918.20 : 151,247.70 = 77,428.20 : x
  2. Step 2: Convert to fraction form
    100,918.20/151,247.70 = 77,428.20/x
  3. Step 3: Cross multiply
    100,918.20x = 151,247.70 × 77,428.20
  4. Step 4: Simplify right side
    100,918.20x = 11,710,837,165.14
  5. Step 5: Solve for x
    x = 11,710,837,165.14/100,918.20
  6. Step 6: Final answer
    x = 116,042.87

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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.