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Finding the Fourth Proportional to 91.70, 137.45 and 45.98

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Solution

The fourth proportional to 91.70, 137.45 and 45.98 is: 68.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.70 : 137.45 = 45.98 : x
  2. Step 2: Convert to fraction form
    91.70/137.45 = 45.98/x
  3. Step 3: Cross multiply
    91.70x = 137.45 × 45.98
  4. Step 4: Simplify right side
    91.70x = 6,320.41
  5. Step 5: Solve for x
    x = 6,320.41/91.70
  6. Step 6: Final answer
    x = 68.93

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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.