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Finding the Fourth Proportional to 641.48, 959.60 and 555.80

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Solution

The fourth proportional to 641.48, 959.60 and 555.80 is: 831.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.48 : 959.60 = 555.80 : x
  2. Step 2: Convert to fraction form
    641.48/959.60 = 555.80/x
  3. Step 3: Cross multiply
    641.48x = 959.60 × 555.80
  4. Step 4: Simplify right side
    641.48x = 533,342.27
  5. Step 5: Solve for x
    x = 533,342.27/641.48
  6. Step 6: Final answer
    x = 831.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.