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Finding the Fourth Proportional to 677.90, 934.53 and 621.20

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Solution

The fourth proportional to 677.90, 934.53 and 621.20 is: 856.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.90 : 934.53 = 621.20 : x
  2. Step 2: Convert to fraction form
    677.90/934.53 = 621.20/x
  3. Step 3: Cross multiply
    677.90x = 934.53 × 621.20
  4. Step 4: Simplify right side
    677.90x = 580,530.04
  5. Step 5: Solve for x
    x = 580,530.04/677.90
  6. Step 6: Final answer
    x = 856.37

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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.