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Finding the Fourth Proportional to 13.02, 18 and 9.78

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Solution

The fourth proportional to 13.02, 18 and 9.78 is: 13.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.02 : 18 = 9.78 : x
  2. Step 2: Convert to fraction form
    13.02/18 = 9.78/x
  3. Step 3: Cross multiply
    13.02x = 18 × 9.78
  4. Step 4: Simplify right side
    13.02x = 176.04
  5. Step 5: Solve for x
    x = 176.04/13.02
  6. Step 6: Final answer
    x = 13.52

Related Problems

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Double scale
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Similar ratio
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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.