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Finding the Fourth Proportional to 761.97, 1,050.56 and 621.95

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Solution

The fourth proportional to 761.97, 1,050.56 and 621.95 is: 857.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.97 : 1,050.56 = 621.95 : x
  2. Step 2: Convert to fraction form
    761.97/1,050.56 = 621.95/x
  3. Step 3: Cross multiply
    761.97x = 1,050.56 × 621.95
  4. Step 4: Simplify right side
    761.97x = 653,395.79
  5. Step 5: Solve for x
    x = 653,395.79/761.97
  6. Step 6: Final answer
    x = 857.51

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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.