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Finding the Fourth Proportional to 917,910.78, 1,375,697.88 and 518,774.10

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Solution

The fourth proportional to 917,910.78, 1,375,697.88 and 518,774.10 is: 777,500.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    917,910.78 : 1,375,697.88 = 518,774.10 : x
  2. Step 2: Convert to fraction form
    917,910.78/1,375,697.88 = 518,774.10/x
  3. Step 3: Cross multiply
    917,910.78x = 1,375,697.88 × 518,774.10
  4. Step 4: Simplify right side
    917,910.78x = 713,676,429,568.91
  5. Step 5: Solve for x
    x = 713,676,429,568.91/917,910.78
  6. Step 6: Final answer
    x = 777,500.87

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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.