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Finding the Fourth Proportional to 774.86, 1,069.35 and 425.55

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Solution

The fourth proportional to 774.86, 1,069.35 and 425.55 is: 587.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.86 : 1,069.35 = 425.55 : x
  2. Step 2: Convert to fraction form
    774.86/1,069.35 = 425.55/x
  3. Step 3: Cross multiply
    774.86x = 1,069.35 × 425.55
  4. Step 4: Simplify right side
    774.86x = 455,061.89
  5. Step 5: Solve for x
    x = 455,061.89/774.86
  6. Step 6: Final answer
    x = 587.29

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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.