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Finding the Fourth Proportional to 638.77, 881.55 and 359.06

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Solution

The fourth proportional to 638.77, 881.55 and 359.06 is: 495.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.77 : 881.55 = 359.06 : x
  2. Step 2: Convert to fraction form
    638.77/881.55 = 359.06/x
  3. Step 3: Cross multiply
    638.77x = 881.55 × 359.06
  4. Step 4: Simplify right side
    638.77x = 316,531.55
  5. Step 5: Solve for x
    x = 316,531.55/638.77
  6. Step 6: Final answer
    x = 495.53

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1.5x scale

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.