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Finding the Fourth Proportional to 774.48, 1,068.75 and 425.15

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Solution

The fourth proportional to 774.48, 1,068.75 and 425.15 is: 586.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.48 : 1,068.75 = 425.15 : x
  2. Step 2: Convert to fraction form
    774.48/1,068.75 = 425.15/x
  3. Step 3: Cross multiply
    774.48x = 1,068.75 × 425.15
  4. Step 4: Simplify right side
    774.48x = 454,373.72
  5. Step 5: Solve for x
    x = 454,373.72/774.48
  6. Step 6: Final answer
    x = 586.68

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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.