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Finding the Fourth Proportional to 927.38, 1,279.10 and 647.64

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Solution

The fourth proportional to 927.38, 1,279.10 and 647.64 is: 893.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.38 : 1,279.10 = 647.64 : x
  2. Step 2: Convert to fraction form
    927.38/1,279.10 = 647.64/x
  3. Step 3: Cross multiply
    927.38x = 1,279.10 × 647.64
  4. Step 4: Simplify right side
    927.38x = 828,396.32
  5. Step 5: Solve for x
    x = 828,396.32/927.38
  6. Step 6: Final answer
    x = 893.27

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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.