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Finding the Fourth Proportional to 661,437.94, 912,714.46 and 389,488

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Solution

The fourth proportional to 661,437.94, 912,714.46 and 389,488 is: 537,452.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,437.94 : 912,714.46 = 389,488 : x
  2. Step 2: Convert to fraction form
    661,437.94/912,714.46 = 389,488/x
  3. Step 3: Cross multiply
    661,437.94x = 912,714.46 × 389,488
  4. Step 4: Simplify right side
    661,437.94x = 355,491,329,596.48
  5. Step 5: Solve for x
    x = 355,491,329,596.48/661,437.94
  6. Step 6: Final answer
    x = 537,452.28

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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.