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Finding the Fourth Proportional to 900.21, 1,242.25 and 507.22

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Solution

The fourth proportional to 900.21, 1,242.25 and 507.22 is: 699.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.21 : 1,242.25 = 507.22 : x
  2. Step 2: Convert to fraction form
    900.21/1,242.25 = 507.22/x
  3. Step 3: Cross multiply
    900.21x = 1,242.25 × 507.22
  4. Step 4: Simplify right side
    900.21x = 630,094.05
  5. Step 5: Solve for x
    x = 630,094.05/900.21
  6. Step 6: Final answer
    x = 699.94

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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.