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Finding the Fourth Proportional to 774.40, 1,068 and 553.48

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Solution

The fourth proportional to 774.40, 1,068 and 553.48 is: 763.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.40 : 1,068 = 553.48 : x
  2. Step 2: Convert to fraction form
    774.40/1,068 = 553.48/x
  3. Step 3: Cross multiply
    774.40x = 1,068 × 553.48
  4. Step 4: Simplify right side
    774.40x = 591,116.64
  5. Step 5: Solve for x
    x = 591,116.64/774.40
  6. Step 6: Final answer
    x = 763.32

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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.