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Finding the Fourth Proportional to 1,042.71, 1,438.16 and 692.79

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Solution

The fourth proportional to 1,042.71, 1,438.16 and 692.79 is: 955.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.71 : 1,438.16 = 692.79 : x
  2. Step 2: Convert to fraction form
    1,042.71/1,438.16 = 692.79/x
  3. Step 3: Cross multiply
    1,042.71x = 1,438.16 × 692.79
  4. Step 4: Simplify right side
    1,042.71x = 996,339.40
  5. Step 5: Solve for x
    x = 996,339.40/1,042.71
  6. Step 6: Final answer
    x = 955.53

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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.