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Finding the Fourth Proportional to 900.28, 1,242.39 and 486.28

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Solution

The fourth proportional to 900.28, 1,242.39 and 486.28 is: 671.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.28 : 1,242.39 = 486.28 : x
  2. Step 2: Convert to fraction form
    900.28/1,242.39 = 486.28/x
  3. Step 3: Cross multiply
    900.28x = 1,242.39 × 486.28
  4. Step 4: Simplify right side
    900.28x = 604,150.05
  5. Step 5: Solve for x
    x = 604,150.05/900.28
  6. Step 6: Final answer
    x = 671.07

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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.