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Finding the Fourth Proportional to 1,373.80, 2,058.90 and 551.40

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Solution

The fourth proportional to 1,373.80, 2,058.90 and 551.40 is: 826.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,373.80 : 2,058.90 = 551.40 : x
  2. Step 2: Convert to fraction form
    1,373.80/2,058.90 = 551.40/x
  3. Step 3: Cross multiply
    1,373.80x = 2,058.90 × 551.40
  4. Step 4: Simplify right side
    1,373.80x = 1,135,277.46
  5. Step 5: Solve for x
    x = 1,135,277.46/1,373.80
  6. Step 6: Final answer
    x = 826.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.