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Finding the Fourth Proportional to 1,407.34, 1,942.14 and 818.02

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Solution

The fourth proportional to 1,407.34, 1,942.14 and 818.02 is: 1,128.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.34 : 1,942.14 = 818.02 : x
  2. Step 2: Convert to fraction form
    1,407.34/1,942.14 = 818.02/x
  3. Step 3: Cross multiply
    1,407.34x = 1,942.14 × 818.02
  4. Step 4: Simplify right side
    1,407.34x = 1,588,709.36
  5. Step 5: Solve for x
    x = 1,588,709.36/1,407.34
  6. Step 6: Final answer
    x = 1,128.87

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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.