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Finding the Fourth Proportional to 818.15, 1,129.34 and 503.84

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Solution

The fourth proportional to 818.15, 1,129.34 and 503.84 is: 695.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.15 : 1,129.34 = 503.84 : x
  2. Step 2: Convert to fraction form
    818.15/1,129.34 = 503.84/x
  3. Step 3: Cross multiply
    818.15x = 1,129.34 × 503.84
  4. Step 4: Simplify right side
    818.15x = 569,006.67
  5. Step 5: Solve for x
    x = 569,006.67/818.15
  6. Step 6: Final answer
    x = 695.48

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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.