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Finding the Fourth Proportional to 887.72, 1,225.16 and 639.86

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Solution

The fourth proportional to 887.72, 1,225.16 and 639.86 is: 883.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.72 : 1,225.16 = 639.86 : x
  2. Step 2: Convert to fraction form
    887.72/1,225.16 = 639.86/x
  3. Step 3: Cross multiply
    887.72x = 1,225.16 × 639.86
  4. Step 4: Simplify right side
    887.72x = 783,926.35
  5. Step 5: Solve for x
    x = 783,926.35/887.72
  6. Step 6: Final answer
    x = 883.08

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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.