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Finding the Fourth Proportional to 778.76, 1,074.65 and 446.95

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Solution

The fourth proportional to 778.76, 1,074.65 and 446.95 is: 616.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.76 : 1,074.65 = 446.95 : x
  2. Step 2: Convert to fraction form
    778.76/1,074.65 = 446.95/x
  3. Step 3: Cross multiply
    778.76x = 1,074.65 × 446.95
  4. Step 4: Simplify right side
    778.76x = 480,314.82
  5. Step 5: Solve for x
    x = 480,314.82/778.76
  6. Step 6: Final answer
    x = 616.77

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Find fourth proportional to 389.38, 537.33 and 223.48
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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.