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Finding the Fourth Proportional to 677.12, 934.47 and 428.42

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Solution

The fourth proportional to 677.12, 934.47 and 428.42 is: 591.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.12 : 934.47 = 428.42 : x
  2. Step 2: Convert to fraction form
    677.12/934.47 = 428.42/x
  3. Step 3: Cross multiply
    677.12x = 934.47 × 428.42
  4. Step 4: Simplify right side
    677.12x = 400,345.64
  5. Step 5: Solve for x
    x = 400,345.64/677.12
  6. Step 6: Final answer
    x = 591.25

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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.