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Finding the Fourth Proportional to 512,739.71, 707,595.07 and 283,311.78

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Solution

The fourth proportional to 512,739.71, 707,595.07 and 283,311.78 is: 390,978.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    512,739.71 : 707,595.07 = 283,311.78 : x
  2. Step 2: Convert to fraction form
    512,739.71/707,595.07 = 283,311.78/x
  3. Step 3: Cross multiply
    512,739.71x = 707,595.07 × 283,311.78
  4. Step 4: Simplify right side
    512,739.71x = 200,470,018,800.93
  5. Step 5: Solve for x
    x = 200,470,018,800.93/512,739.71
  6. Step 6: Final answer
    x = 390,978.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.