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Finding the Fourth Proportional to 157.08, 216.72 and 90.66

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Solution

The fourth proportional to 157.08, 216.72 and 90.66 is: 125.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.08 : 216.72 = 90.66 : x
  2. Step 2: Convert to fraction form
    157.08/216.72 = 90.66/x
  3. Step 3: Cross multiply
    157.08x = 216.72 × 90.66
  4. Step 4: Simplify right side
    157.08x = 19,647.84
  5. Step 5: Solve for x
    x = 19,647.84/157.08
  6. Step 6: Final answer
    x = 125.08

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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.