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Finding the Fourth Proportional to 113.45, 156.58 and 89.00

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Solution

The fourth proportional to 113.45, 156.58 and 89.00 is: 122.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.45 : 156.58 = 89.00 : x
  2. Step 2: Convert to fraction form
    113.45/156.58 = 89.00/x
  3. Step 3: Cross multiply
    113.45x = 156.58 × 89.00
  4. Step 4: Simplify right side
    113.45x = 13,935.70
  5. Step 5: Solve for x
    x = 13,935.70/113.45
  6. Step 6: Final answer
    x = 122.83

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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.