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Finding the Fourth Proportional to 107.10, 160.05 and 86.30

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Solution

The fourth proportional to 107.10, 160.05 and 86.30 is: 128.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.10 : 160.05 = 86.30 : x
  2. Step 2: Convert to fraction form
    107.10/160.05 = 86.30/x
  3. Step 3: Cross multiply
    107.10x = 160.05 × 86.30
  4. Step 4: Simplify right side
    107.10x = 13,813.34
  5. Step 5: Solve for x
    x = 13,813.34/107.10
  6. Step 6: Final answer
    x = 128.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.