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Finding the Fourth Proportional to 976.32, 1,345.68 and 644.58

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Solution

The fourth proportional to 976.32, 1,345.68 and 644.58 is: 888.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.32 : 1,345.68 = 644.58 : x
  2. Step 2: Convert to fraction form
    976.32/1,345.68 = 644.58/x
  3. Step 3: Cross multiply
    976.32x = 1,345.68 × 644.58
  4. Step 4: Simplify right side
    976.32x = 867,398.41
  5. Step 5: Solve for x
    x = 867,398.41/976.32
  6. Step 6: Final answer
    x = 888.44

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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.