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Finding the Fourth Proportional to 774.42, 1,069.20 and 512.79

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Solution

The fourth proportional to 774.42, 1,069.20 and 512.79 is: 707.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.42 : 1,069.20 = 512.79 : x
  2. Step 2: Convert to fraction form
    774.42/1,069.20 = 512.79/x
  3. Step 3: Cross multiply
    774.42x = 1,069.20 × 512.79
  4. Step 4: Simplify right side
    774.42x = 548,275.07
  5. Step 5: Solve for x
    x = 548,275.07/774.42
  6. Step 6: Final answer
    x = 707.98

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Double scale
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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.