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Finding the Fourth Proportional to 105.29, 157.50 and 90.63

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Solution

The fourth proportional to 105.29, 157.50 and 90.63 is: 135.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.29 : 157.50 = 90.63 : x
  2. Step 2: Convert to fraction form
    105.29/157.50 = 90.63/x
  3. Step 3: Cross multiply
    105.29x = 157.50 × 90.63
  4. Step 4: Simplify right side
    105.29x = 14,272.98
  5. Step 5: Solve for x
    x = 14,272.98/105.29
  6. Step 6: Final answer
    x = 135.57

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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.