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Finding the Fourth Proportional to 774.75, 1,069.15 and 443.16

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Solution

The fourth proportional to 774.75, 1,069.15 and 443.16 is: 611.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.75 : 1,069.15 = 443.16 : x
  2. Step 2: Convert to fraction form
    774.75/1,069.15 = 443.16/x
  3. Step 3: Cross multiply
    774.75x = 1,069.15 × 443.16
  4. Step 4: Simplify right side
    774.75x = 473,804.51
  5. Step 5: Solve for x
    x = 473,804.51/774.75
  6. Step 6: Final answer
    x = 611.56

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Find fourth proportional to 387.38, 534.58 and 221.58
Half scale
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Double scale
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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.