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Finding the Fourth Proportional to 1,409.43, 1,942.95 and 988.52

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Solution

The fourth proportional to 1,409.43, 1,942.95 and 988.52 is: 1,362.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,409.43 : 1,942.95 = 988.52 : x
  2. Step 2: Convert to fraction form
    1,409.43/1,942.95 = 988.52/x
  3. Step 3: Cross multiply
    1,409.43x = 1,942.95 × 988.52
  4. Step 4: Simplify right side
    1,409.43x = 1,920,635.22
  5. Step 5: Solve for x
    x = 1,920,635.22/1,409.43
  6. Step 6: Final answer
    x = 1,362.70

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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.