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Finding the Fourth Proportional to 774.58, 1,069.48 and 553.76

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Solution

The fourth proportional to 774.58, 1,069.48 and 553.76 is: 764.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.58 : 1,069.48 = 553.76 : x
  2. Step 2: Convert to fraction form
    774.58/1,069.48 = 553.76/x
  3. Step 3: Cross multiply
    774.58x = 1,069.48 × 553.76
  4. Step 4: Simplify right side
    774.58x = 592,235.24
  5. Step 5: Solve for x
    x = 592,235.24/774.58
  6. Step 6: Final answer
    x = 764.59

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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.