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Finding the Fourth Proportional to 900.21, 1,242 and 507.14

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Solution

The fourth proportional to 900.21, 1,242 and 507.14 is: 699.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.21 : 1,242 = 507.14 : x
  2. Step 2: Convert to fraction form
    900.21/1,242 = 507.14/x
  3. Step 3: Cross multiply
    900.21x = 1,242 × 507.14
  4. Step 4: Simplify right side
    900.21x = 629,861.67
  5. Step 5: Solve for x
    x = 629,861.67/900.21
  6. Step 6: Final answer
    x = 699.68

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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.