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Finding the Fourth Proportional to 113.34, 156.40 and 90.05

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Solution

The fourth proportional to 113.34, 156.40 and 90.05 is: 124.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.34 : 156.40 = 90.05 : x
  2. Step 2: Convert to fraction form
    113.34/156.40 = 90.05/x
  3. Step 3: Cross multiply
    113.34x = 156.40 × 90.05
  4. Step 4: Simplify right side
    113.34x = 14,082.81
  5. Step 5: Solve for x
    x = 14,082.81/113.34
  6. Step 6: Final answer
    x = 124.25

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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.