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Finding the Fourth Proportional to 918,999.40, 1,375,388.70 and 918,999.40

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Solution

The fourth proportional to 918,999.40, 1,375,388.70 and 918,999.40 is: 1,375,388.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,999.40 : 1,375,388.70 = 918,999.40 : x
  2. Step 2: Convert to fraction form
    918,999.40/1,375,388.70 = 918,999.40/x
  3. Step 3: Cross multiply
    918,999.40x = 1,375,388.70 × 918,999.40
  4. Step 4: Simplify right side
    918,999.40x = 1,263,981,390,066.78
  5. Step 5: Solve for x
    x = 1,263,981,390,066.78/918,999.40
  6. Step 6: Final answer
    x = 1,375,388.70

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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.