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Finding the Fourth Proportional to 900.61, 1,242.84 and 486.61

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Solution

The fourth proportional to 900.61, 1,242.84 and 486.61 is: 671.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.61 : 1,242.84 = 486.61 : x
  2. Step 2: Convert to fraction form
    900.61/1,242.84 = 486.61/x
  3. Step 3: Cross multiply
    900.61x = 1,242.84 × 486.61
  4. Step 4: Simplify right side
    900.61x = 604,778.05
  5. Step 5: Solve for x
    x = 604,778.05/900.61
  6. Step 6: Final answer
    x = 671.52

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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.