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Finding the Fourth Proportional to 1,117.54, 1,540.38 and 855.10

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Solution

The fourth proportional to 1,117.54, 1,540.38 and 855.10 is: 1,178.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.54 : 1,540.38 = 855.10 : x
  2. Step 2: Convert to fraction form
    1,117.54/1,540.38 = 855.10/x
  3. Step 3: Cross multiply
    1,117.54x = 1,540.38 × 855.10
  4. Step 4: Simplify right side
    1,117.54x = 1,317,178.94
  5. Step 5: Solve for x
    x = 1,317,178.94/1,117.54
  6. Step 6: Final answer
    x = 1,178.64

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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.