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Finding the Fourth Proportional to 77.58, 116.61 and 56.34

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Solution

The fourth proportional to 77.58, 116.61 and 56.34 is: 84.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.58 : 116.61 = 56.34 : x
  2. Step 2: Convert to fraction form
    77.58/116.61 = 56.34/x
  3. Step 3: Cross multiply
    77.58x = 116.61 × 56.34
  4. Step 4: Simplify right side
    77.58x = 6,569.81
  5. Step 5: Solve for x
    x = 6,569.81/77.58
  6. Step 6: Final answer
    x = 84.68

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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.