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Finding the Fourth Proportional to 774.83, 1,069.30 and 554.31

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Solution

The fourth proportional to 774.83, 1,069.30 and 554.31 is: 764.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.83 : 1,069.30 = 554.31 : x
  2. Step 2: Convert to fraction form
    774.83/1,069.30 = 554.31/x
  3. Step 3: Cross multiply
    774.83x = 1,069.30 × 554.31
  4. Step 4: Simplify right side
    774.83x = 592,720.91
  5. Step 5: Solve for x
    x = 592,720.91/774.83
  6. Step 6: Final answer
    x = 764.97

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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.