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Finding the Fourth Proportional to 774.96, 1,069.46 and 425.66

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Solution

The fourth proportional to 774.96, 1,069.46 and 425.66 is: 587.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.96 : 1,069.46 = 425.66 : x
  2. Step 2: Convert to fraction form
    774.96/1,069.46 = 425.66/x
  3. Step 3: Cross multiply
    774.96x = 1,069.46 × 425.66
  4. Step 4: Simplify right side
    774.96x = 455,226.34
  5. Step 5: Solve for x
    x = 455,226.34/774.96
  6. Step 6: Final answer
    x = 587.42

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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.