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Finding the Fourth Proportional to 83.75, 115.59 and 65.30

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Solution

The fourth proportional to 83.75, 115.59 and 65.30 is: 90.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.75 : 115.59 = 65.30 : x
  2. Step 2: Convert to fraction form
    83.75/115.59 = 65.30/x
  3. Step 3: Cross multiply
    83.75x = 115.59 × 65.30
  4. Step 4: Simplify right side
    83.75x = 7,547.45
  5. Step 5: Solve for x
    x = 7,547.45/83.75
  6. Step 6: Final answer
    x = 90.12

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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.