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Finding the Fourth Proportional to 774.45, 1,068.75 and 425.14

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Solution

The fourth proportional to 774.45, 1,068.75 and 425.14 is: 586.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.45 : 1,068.75 = 425.14 : x
  2. Step 2: Convert to fraction form
    774.45/1,068.75 = 425.14/x
  3. Step 3: Cross multiply
    774.45x = 1,068.75 × 425.14
  4. Step 4: Simplify right side
    774.45x = 454,368.38
  5. Step 5: Solve for x
    x = 454,368.38/774.45
  6. Step 6: Final answer
    x = 586.70

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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.