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Finding the Fourth Proportional to 114.36, 157.88 and 90.70

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Solution

The fourth proportional to 114.36, 157.88 and 90.70 is: 125.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.36 : 157.88 = 90.70 : x
  2. Step 2: Convert to fraction form
    114.36/157.88 = 90.70/x
  3. Step 3: Cross multiply
    114.36x = 157.88 × 90.70
  4. Step 4: Simplify right side
    114.36x = 14,319.72
  5. Step 5: Solve for x
    x = 14,319.72/114.36
  6. Step 6: Final answer
    x = 125.22

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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.