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Finding the Fourth Proportional to 1,407.96, 1,942.95 and 818.61

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Solution

The fourth proportional to 1,407.96, 1,942.95 and 818.61 is: 1,129.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.96 : 1,942.95 = 818.61 : x
  2. Step 2: Convert to fraction form
    1,407.96/1,942.95 = 818.61/x
  3. Step 3: Cross multiply
    1,407.96x = 1,942.95 × 818.61
  4. Step 4: Simplify right side
    1,407.96x = 1,590,518.30
  5. Step 5: Solve for x
    x = 1,590,518.30/1,407.96
  6. Step 6: Final answer
    x = 1,129.66

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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.