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Finding the Fourth Proportional to 900.15, 1,242.24 and 507.21

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Solution

The fourth proportional to 900.15, 1,242.24 and 507.21 is: 699.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.15 : 1,242.24 = 507.21 : x
  2. Step 2: Convert to fraction form
    900.15/1,242.24 = 507.21/x
  3. Step 3: Cross multiply
    900.15x = 1,242.24 × 507.21
  4. Step 4: Simplify right side
    900.15x = 630,076.55
  5. Step 5: Solve for x
    x = 630,076.55/900.15
  6. Step 6: Final answer
    x = 699.97

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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.