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Finding the Fourth Proportional to 97.64, 145.77 and 79.40

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Solution

The fourth proportional to 97.64, 145.77 and 79.40 is: 118.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.64 : 145.77 = 79.40 : x
  2. Step 2: Convert to fraction form
    97.64/145.77 = 79.40/x
  3. Step 3: Cross multiply
    97.64x = 145.77 × 79.40
  4. Step 4: Simplify right side
    97.64x = 11,574.14
  5. Step 5: Solve for x
    x = 11,574.14/97.64
  6. Step 6: Final answer
    x = 118.54

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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.