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Finding the Fourth Proportional to 86.77, 129.98 and 56.36

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Solution

The fourth proportional to 86.77, 129.98 and 56.36 is: 84.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.77 : 129.98 = 56.36 : x
  2. Step 2: Convert to fraction form
    86.77/129.98 = 56.36/x
  3. Step 3: Cross multiply
    86.77x = 129.98 × 56.36
  4. Step 4: Simplify right side
    86.77x = 7,325.67
  5. Step 5: Solve for x
    x = 7,325.67/86.77
  6. Step 6: Final answer
    x = 84.43

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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.