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Finding the Fourth Proportional to 976.51, 1,348.10 and 663.45

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Solution

The fourth proportional to 976.51, 1,348.10 and 663.45 is: 915.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.51 : 1,348.10 = 663.45 : x
  2. Step 2: Convert to fraction form
    976.51/1,348.10 = 663.45/x
  3. Step 3: Cross multiply
    976.51x = 1,348.10 × 663.45
  4. Step 4: Simplify right side
    976.51x = 894,396.95
  5. Step 5: Solve for x
    x = 894,396.95/976.51
  6. Step 6: Final answer
    x = 915.91

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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.