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Finding the Fourth Proportional to 85.16, 117.57 and 56.07

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Solution

The fourth proportional to 85.16, 117.57 and 56.07 is: 77.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.16 : 117.57 = 56.07 : x
  2. Step 2: Convert to fraction form
    85.16/117.57 = 56.07/x
  3. Step 3: Cross multiply
    85.16x = 117.57 × 56.07
  4. Step 4: Simplify right side
    85.16x = 6,592.15
  5. Step 5: Solve for x
    x = 6,592.15/85.16
  6. Step 6: Final answer
    x = 77.41

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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.