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Finding the Fourth Proportional to 677.60, 1,015.56 and 312

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Solution

The fourth proportional to 677.60, 1,015.56 and 312 is: 467.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.60 : 1,015.56 = 312 : x
  2. Step 2: Convert to fraction form
    677.60/1,015.56 = 312/x
  3. Step 3: Cross multiply
    677.60x = 1,015.56 × 312
  4. Step 4: Simplify right side
    677.60x = 316,854.72
  5. Step 5: Solve for x
    x = 316,854.72/677.60
  6. Step 6: Final answer
    x = 467.61

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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.