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Finding the Fourth Proportional to 253.03, 379.45 and 90.69

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Solution

The fourth proportional to 253.03, 379.45 and 90.69 is: 136.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.03 : 379.45 = 90.69 : x
  2. Step 2: Convert to fraction form
    253.03/379.45 = 90.69/x
  3. Step 3: Cross multiply
    253.03x = 379.45 × 90.69
  4. Step 4: Simplify right side
    253.03x = 34,412.32
  5. Step 5: Solve for x
    x = 34,412.32/253.03
  6. Step 6: Final answer
    x = 136.00

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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.