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Finding the Fourth Proportional to 921.44, 1,381.15 and 647.46

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Solution

The fourth proportional to 921.44, 1,381.15 and 647.46 is: 970.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.44 : 1,381.15 = 647.46 : x
  2. Step 2: Convert to fraction form
    921.44/1,381.15 = 647.46/x
  3. Step 3: Cross multiply
    921.44x = 1,381.15 × 647.46
  4. Step 4: Simplify right side
    921.44x = 894,240.19
  5. Step 5: Solve for x
    x = 894,240.19/921.44
  6. Step 6: Final answer
    x = 970.48

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Double scale
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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.