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Finding the Fourth Proportional to 641.74, 958.51 and 555.34

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Solution

The fourth proportional to 641.74, 958.51 and 555.34 is: 829.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.74 : 958.51 = 555.34 : x
  2. Step 2: Convert to fraction form
    641.74/958.51 = 555.34/x
  3. Step 3: Cross multiply
    641.74x = 958.51 × 555.34
  4. Step 4: Simplify right side
    641.74x = 532,296.17
  5. Step 5: Solve for x
    x = 532,296.17/641.74
  6. Step 6: Final answer
    x = 829.46

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.