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Finding the Fourth Proportional to 661,761.86, 913,312.44 and 389,815.70

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Solution

The fourth proportional to 661,761.86, 913,312.44 and 389,815.70 is: 537,993.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,761.86 : 913,312.44 = 389,815.70 : x
  2. Step 2: Convert to fraction form
    661,761.86/913,312.44 = 389,815.70/x
  3. Step 3: Cross multiply
    661,761.86x = 913,312.44 × 389,815.70
  4. Step 4: Simplify right side
    661,761.86x = 356,023,528,117.31
  5. Step 5: Solve for x
    x = 356,023,528,117.31/661,761.86
  6. Step 6: Final answer
    x = 537,993.42

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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.