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Finding the Fourth Proportional to 91.05, 136.70 and 56.70

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Solution

The fourth proportional to 91.05, 136.70 and 56.70 is: 85.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.05 : 136.70 = 56.70 : x
  2. Step 2: Convert to fraction form
    91.05/136.70 = 56.70/x
  3. Step 3: Cross multiply
    91.05x = 136.70 × 56.70
  4. Step 4: Simplify right side
    91.05x = 7,750.89
  5. Step 5: Solve for x
    x = 7,750.89/91.05
  6. Step 6: Final answer
    x = 85.13

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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.