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Finding the Fourth Proportional to 888.95, 1,225.08 and 639.83

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Solution

The fourth proportional to 888.95, 1,225.08 and 639.83 is: 881.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.95 : 1,225.08 = 639.83 : x
  2. Step 2: Convert to fraction form
    888.95/1,225.08 = 639.83/x
  3. Step 3: Cross multiply
    888.95x = 1,225.08 × 639.83
  4. Step 4: Simplify right side
    888.95x = 783,836.81
  5. Step 5: Solve for x
    x = 783,836.81/888.95
  6. Step 6: Final answer
    x = 881.76

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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.