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Finding the Fourth Proportional to 996.72, 1,374.76 and 647.76

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Solution

The fourth proportional to 996.72, 1,374.76 and 647.76 is: 893.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.72 : 1,374.76 = 647.76 : x
  2. Step 2: Convert to fraction form
    996.72/1,374.76 = 647.76/x
  3. Step 3: Cross multiply
    996.72x = 1,374.76 × 647.76
  4. Step 4: Simplify right side
    996.72x = 890,514.54
  5. Step 5: Solve for x
    x = 890,514.54/996.72
  6. Step 6: Final answer
    x = 893.45

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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.