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Finding the Fourth Proportional to 815.89, 1,224.23 and 507.66

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Solution

The fourth proportional to 815.89, 1,224.23 and 507.66 is: 761.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.89 : 1,224.23 = 507.66 : x
  2. Step 2: Convert to fraction form
    815.89/1,224.23 = 507.66/x
  3. Step 3: Cross multiply
    815.89x = 1,224.23 × 507.66
  4. Step 4: Simplify right side
    815.89x = 621,492.86
  5. Step 5: Solve for x
    x = 621,492.86/815.89
  6. Step 6: Final answer
    x = 761.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.