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Finding the Fourth Proportional to 887.83, 1,225.32 and 639.97

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Solution

The fourth proportional to 887.83, 1,225.32 and 639.97 is: 883.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.83 : 1,225.32 = 639.97 : x
  2. Step 2: Convert to fraction form
    887.83/1,225.32 = 639.97/x
  3. Step 3: Cross multiply
    887.83x = 1,225.32 × 639.97
  4. Step 4: Simplify right side
    887.83x = 784,158.71
  5. Step 5: Solve for x
    x = 784,158.71/887.83
  6. Step 6: Final answer
    x = 883.24

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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.