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Finding the Fourth Proportional to 661,518.86, 912,963.82 and 389,672.32

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Solution

The fourth proportional to 661,518.86, 912,963.82 and 389,672.32 is: 537,787.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,518.86 : 912,963.82 = 389,672.32 : x
  2. Step 2: Convert to fraction form
    661,518.86/912,963.82 = 389,672.32/x
  3. Step 3: Cross multiply
    661,518.86x = 912,963.82 × 389,672.32
  4. Step 4: Simplify right side
    661,518.86x = 355,756,729,815.46
  5. Step 5: Solve for x
    x = 355,756,729,815.46/661,518.86
  6. Step 6: Final answer
    x = 537,787.74

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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.