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Finding the Fourth Proportional to 86.72, 130.10 and 35.35

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Solution

The fourth proportional to 86.72, 130.10 and 35.35 is: 53.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.72 : 130.10 = 35.35 : x
  2. Step 2: Convert to fraction form
    86.72/130.10 = 35.35/x
  3. Step 3: Cross multiply
    86.72x = 130.10 × 35.35
  4. Step 4: Simplify right side
    86.72x = 4,598.80
  5. Step 5: Solve for x
    x = 4,598.80/86.72
  6. Step 6: Final answer
    x = 53.03

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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.