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Finding the Fourth Proportional to 881.18, 1,214.48 and 644.76

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Solution

The fourth proportional to 881.18, 1,214.48 and 644.76 is: 888.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.18 : 1,214.48 = 644.76 : x
  2. Step 2: Convert to fraction form
    881.18/1,214.48 = 644.76/x
  3. Step 3: Cross multiply
    881.18x = 1,214.48 × 644.76
  4. Step 4: Simplify right side
    881.18x = 783,044.90
  5. Step 5: Solve for x
    x = 783,044.90/881.18
  6. Step 6: Final answer
    x = 888.64

Related Problems

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Half scale
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Double scale
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1.5x scale

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.