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Finding the Fourth Proportional to 59.10, 81.62 and 51.70

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Solution

The fourth proportional to 59.10, 81.62 and 51.70 is: 71.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.10 : 81.62 = 51.70 : x
  2. Step 2: Convert to fraction form
    59.10/81.62 = 51.70/x
  3. Step 3: Cross multiply
    59.10x = 81.62 × 51.70
  4. Step 4: Simplify right side
    59.10x = 4,219.75
  5. Step 5: Solve for x
    x = 4,219.75/59.10
  6. Step 6: Final answer
    x = 71.40

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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.