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Finding the Fourth Proportional to 1,007.72, 1,390.22 and 692.48

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Solution

The fourth proportional to 1,007.72, 1,390.22 and 692.48 is: 955.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.72 : 1,390.22 = 692.48 : x
  2. Step 2: Convert to fraction form
    1,007.72/1,390.22 = 692.48/x
  3. Step 3: Cross multiply
    1,007.72x = 1,390.22 × 692.48
  4. Step 4: Simplify right side
    1,007.72x = 962,699.55
  5. Step 5: Solve for x
    x = 962,699.55/1,007.72
  6. Step 6: Final answer
    x = 955.32

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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.