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Finding the Fourth Proportional to 661,435.94, 912,711.70 and 389,486

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Solution

The fourth proportional to 661,435.94, 912,711.70 and 389,486 is: 537,449.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,435.94 : 912,711.70 = 389,486 : x
  2. Step 2: Convert to fraction form
    661,435.94/912,711.70 = 389,486/x
  3. Step 3: Cross multiply
    661,435.94x = 912,711.70 × 389,486
  4. Step 4: Simplify right side
    661,435.94x = 355,488,429,186.20
  5. Step 5: Solve for x
    x = 355,488,429,186.20/661,435.94
  6. Step 6: Final answer
    x = 537,449.52

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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.