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Finding the Fourth Proportional to 61.16, 91.74 and 18.40

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Solution

The fourth proportional to 61.16, 91.74 and 18.40 is: 27.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.16 : 91.74 = 18.40 : x
  2. Step 2: Convert to fraction form
    61.16/91.74 = 18.40/x
  3. Step 3: Cross multiply
    61.16x = 91.74 × 18.40
  4. Step 4: Simplify right side
    61.16x = 1,688.02
  5. Step 5: Solve for x
    x = 1,688.02/61.16
  6. Step 6: Final answer
    x = 27.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.