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Finding the Fourth Proportional to 982.76, 1,356.18 and 851.72

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Solution

The fourth proportional to 982.76, 1,356.18 and 851.72 is: 1,175.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.76 : 1,356.18 = 851.72 : x
  2. Step 2: Convert to fraction form
    982.76/1,356.18 = 851.72/x
  3. Step 3: Cross multiply
    982.76x = 1,356.18 × 851.72
  4. Step 4: Simplify right side
    982.76x = 1,155,085.63
  5. Step 5: Solve for x
    x = 1,155,085.63/982.76
  6. Step 6: Final answer
    x = 1,175.35

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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.