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Finding the Fourth Proportional to 153.19, 211.37 and 90.15

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Solution

The fourth proportional to 153.19, 211.37 and 90.15 is: 124.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.19 : 211.37 = 90.15 : x
  2. Step 2: Convert to fraction form
    153.19/211.37 = 90.15/x
  3. Step 3: Cross multiply
    153.19x = 211.37 × 90.15
  4. Step 4: Simplify right side
    153.19x = 19,055.01
  5. Step 5: Solve for x
    x = 19,055.01/153.19
  6. Step 6: Final answer
    x = 124.39

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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.