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Finding the Fourth Proportional to 157.40, 235.90 and 66.05

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Solution

The fourth proportional to 157.40, 235.90 and 66.05 is: 98.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.40 : 235.90 = 66.05 : x
  2. Step 2: Convert to fraction form
    157.40/235.90 = 66.05/x
  3. Step 3: Cross multiply
    157.40x = 235.90 × 66.05
  4. Step 4: Simplify right side
    157.40x = 15,579.85
  5. Step 5: Solve for x
    x = 15,579.85/157.40
  6. Step 6: Final answer
    x = 98.98

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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.