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Finding the Fourth Proportional to 59.81, 90.15 and 56.51

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Solution

The fourth proportional to 59.81, 90.15 and 56.51 is: 85.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.81 : 90.15 = 56.51 : x
  2. Step 2: Convert to fraction form
    59.81/90.15 = 56.51/x
  3. Step 3: Cross multiply
    59.81x = 90.15 × 56.51
  4. Step 4: Simplify right side
    59.81x = 5,093.93
  5. Step 5: Solve for x
    x = 5,093.93/59.81
  6. Step 6: Final answer
    x = 85.18

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.