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Finding the Fourth Proportional to 664,399.86, 916,751.08 and 392,512.02

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Solution

The fourth proportional to 664,399.86, 916,751.08 and 392,512.02 is: 541,595.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,399.86 : 916,751.08 = 392,512.02 : x
  2. Step 2: Convert to fraction form
    664,399.86/916,751.08 = 392,512.02/x
  3. Step 3: Cross multiply
    664,399.86x = 916,751.08 × 392,512.02
  4. Step 4: Simplify right side
    664,399.86x = 359,835,818,247.98
  5. Step 5: Solve for x
    x = 359,835,818,247.98/664,399.86
  6. Step 6: Final answer
    x = 541,595.27

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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.