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Finding the Fourth Proportional to 677.46, 1,018.34 and 648.66

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Solution

The fourth proportional to 677.46, 1,018.34 and 648.66 is: 975.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.46 : 1,018.34 = 648.66 : x
  2. Step 2: Convert to fraction form
    677.46/1,018.34 = 648.66/x
  3. Step 3: Cross multiply
    677.46x = 1,018.34 × 648.66
  4. Step 4: Simplify right side
    677.46x = 660,556.42
  5. Step 5: Solve for x
    x = 660,556.42/677.46
  6. Step 6: Final answer
    x = 975.05

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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.