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Finding the Fourth Proportional to 157.60, 217.47 and 90.31

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Solution

The fourth proportional to 157.60, 217.47 and 90.31 is: 124.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.60 : 217.47 = 90.31 : x
  2. Step 2: Convert to fraction form
    157.60/217.47 = 90.31/x
  3. Step 3: Cross multiply
    157.60x = 217.47 × 90.31
  4. Step 4: Simplify right side
    157.60x = 19,639.72
  5. Step 5: Solve for x
    x = 19,639.72/157.60
  6. Step 6: Final answer
    x = 124.62

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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.