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Finding the Fourth Proportional to 153.66, 211.98 and 91.47

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Solution

The fourth proportional to 153.66, 211.98 and 91.47 is: 126.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.66 : 211.98 = 91.47 : x
  2. Step 2: Convert to fraction form
    153.66/211.98 = 91.47/x
  3. Step 3: Cross multiply
    153.66x = 211.98 × 91.47
  4. Step 4: Simplify right side
    153.66x = 19,389.81
  5. Step 5: Solve for x
    x = 19,389.81/153.66
  6. Step 6: Final answer
    x = 126.19

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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.