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Finding the Fourth Proportional to 86.88, 130.07 and 56.35

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Solution

The fourth proportional to 86.88, 130.07 and 56.35 is: 84.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.88 : 130.07 = 56.35 : x
  2. Step 2: Convert to fraction form
    86.88/130.07 = 56.35/x
  3. Step 3: Cross multiply
    86.88x = 130.07 × 56.35
  4. Step 4: Simplify right side
    86.88x = 7,329.16
  5. Step 5: Solve for x
    x = 7,329.16/86.88
  6. Step 6: Final answer
    x = 84.36

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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.