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Finding the Fourth Proportional to 1,290.10, 1,781.10 and 848.76

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Solution

The fourth proportional to 1,290.10, 1,781.10 and 848.76 is: 1,171.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.10 : 1,781.10 = 848.76 : x
  2. Step 2: Convert to fraction form
    1,290.10/1,781.10 = 848.76/x
  3. Step 3: Cross multiply
    1,290.10x = 1,781.10 × 848.76
  4. Step 4: Simplify right side
    1,290.10x = 1,511,726.44
  5. Step 5: Solve for x
    x = 1,511,726.44/1,290.10
  6. Step 6: Final answer
    x = 1,171.79

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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.