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Finding the Fourth Proportional to 1,425.84, 1,965.60 and 1,004.87

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Solution

The fourth proportional to 1,425.84, 1,965.60 and 1,004.87 is: 1,385.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.84 : 1,965.60 = 1,004.87 : x
  2. Step 2: Convert to fraction form
    1,425.84/1,965.60 = 1,004.87/x
  3. Step 3: Cross multiply
    1,425.84x = 1,965.60 × 1,004.87
  4. Step 4: Simplify right side
    1,425.84x = 1,975,177.39
  5. Step 5: Solve for x
    x = 1,975,177.39/1,425.84
  6. Step 6: Final answer
    x = 1,385.28

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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.