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Finding the Fourth Proportional to 661,519.86, 912,965.20 and 389,673.32

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Solution

The fourth proportional to 661,519.86, 912,965.20 and 389,673.32 is: 537,789.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,519.86 : 912,965.20 = 389,673.32 : x
  2. Step 2: Convert to fraction form
    661,519.86/912,965.20 = 389,673.32/x
  3. Step 3: Cross multiply
    661,519.86x = 912,965.20 × 389,673.32
  4. Step 4: Simplify right side
    661,519.86x = 355,758,180,528.46
  5. Step 5: Solve for x
    x = 355,758,180,528.46/661,519.86
  6. Step 6: Final answer
    x = 537,789.12

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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.