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Finding the Fourth Proportional to 774.60, 1,068.32 and 681.14

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Solution

The fourth proportional to 774.60, 1,068.32 and 681.14 is: 939.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.60 : 1,068.32 = 681.14 : x
  2. Step 2: Convert to fraction form
    774.60/1,068.32 = 681.14/x
  3. Step 3: Cross multiply
    774.60x = 1,068.32 × 681.14
  4. Step 4: Simplify right side
    774.60x = 727,675.48
  5. Step 5: Solve for x
    x = 727,675.48/774.60
  6. Step 6: Final answer
    x = 939.42

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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.