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Finding the Fourth Proportional to 105.64, 157.76 and 87.40

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Solution

The fourth proportional to 105.64, 157.76 and 87.40 is: 130.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.64 : 157.76 = 87.40 : x
  2. Step 2: Convert to fraction form
    105.64/157.76 = 87.40/x
  3. Step 3: Cross multiply
    105.64x = 157.76 × 87.40
  4. Step 4: Simplify right side
    105.64x = 13,788.22
  5. Step 5: Solve for x
    x = 13,788.22/105.64
  6. Step 6: Final answer
    x = 130.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.