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Finding the Fourth Proportional to 774.76, 1,069.19 and 443.17

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Solution

The fourth proportional to 774.76, 1,069.19 and 443.17 is: 611.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.76 : 1,069.19 = 443.17 : x
  2. Step 2: Convert to fraction form
    774.76/1,069.19 = 443.17/x
  3. Step 3: Cross multiply
    774.76x = 1,069.19 × 443.17
  4. Step 4: Simplify right side
    774.76x = 473,832.93
  5. Step 5: Solve for x
    x = 473,832.93/774.76
  6. Step 6: Final answer
    x = 611.59

Related Problems

Find fourth proportional to 387.38, 534.60 and 221.59
Half scale
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Double scale
Find fourth proportional to 775.76, 1,070.57 and 444.17
Similar ratio
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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.