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Finding the Fourth Proportional to 881.85, 1,215.78 and 705.45

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Solution

The fourth proportional to 881.85, 1,215.78 and 705.45 is: 972.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.85 : 1,215.78 = 705.45 : x
  2. Step 2: Convert to fraction form
    881.85/1,215.78 = 705.45/x
  3. Step 3: Cross multiply
    881.85x = 1,215.78 × 705.45
  4. Step 4: Simplify right side
    881.85x = 857,672.00
  5. Step 5: Solve for x
    x = 857,672.00/881.85
  6. Step 6: Final answer
    x = 972.58

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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.