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Finding the Fourth Proportional to 89.90, 124.02 and 53.06

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Solution

The fourth proportional to 89.90, 124.02 and 53.06 is: 73.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.90 : 124.02 = 53.06 : x
  2. Step 2: Convert to fraction form
    89.90/124.02 = 53.06/x
  3. Step 3: Cross multiply
    89.90x = 124.02 × 53.06
  4. Step 4: Simplify right side
    89.90x = 6,579.88
  5. Step 5: Solve for x
    x = 6,579.88/89.90
  6. Step 6: Final answer
    x = 73.20

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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.