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Finding the Fourth Proportional to 881.84, 1,323.55 and 647.87

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Solution

The fourth proportional to 881.84, 1,323.55 and 647.87 is: 972.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.84 : 1,323.55 = 647.87 : x
  2. Step 2: Convert to fraction form
    881.84/1,323.55 = 647.87/x
  3. Step 3: Cross multiply
    881.84x = 1,323.55 × 647.87
  4. Step 4: Simplify right side
    881.84x = 857,489.98
  5. Step 5: Solve for x
    x = 857,489.98/881.84
  6. Step 6: Final answer
    x = 972.39

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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.