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Finding the Fourth Proportional to 1,042.68, 1,438.09 and 669.70

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Solution

The fourth proportional to 1,042.68, 1,438.09 and 669.70 is: 923.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.68 : 1,438.09 = 669.70 : x
  2. Step 2: Convert to fraction form
    1,042.68/1,438.09 = 669.70/x
  3. Step 3: Cross multiply
    1,042.68x = 1,438.09 × 669.70
  4. Step 4: Simplify right side
    1,042.68x = 963,088.87
  5. Step 5: Solve for x
    x = 963,088.87/1,042.68
  6. Step 6: Final answer
    x = 923.67

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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.