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Finding the Fourth Proportional to 774.83, 1,070.80 and 634.73

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Solution

The fourth proportional to 774.83, 1,070.80 and 634.73 is: 877.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.83 : 1,070.80 = 634.73 : x
  2. Step 2: Convert to fraction form
    774.83/1,070.80 = 634.73/x
  3. Step 3: Cross multiply
    774.83x = 1,070.80 × 634.73
  4. Step 4: Simplify right side
    774.83x = 679,668.53
  5. Step 5: Solve for x
    x = 679,668.53/774.83
  6. Step 6: Final answer
    x = 877.18

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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.