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Finding the Fourth Proportional to 1,291.70, 1,937.88 and 551.34

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Solution

The fourth proportional to 1,291.70, 1,937.88 and 551.34 is: 827.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.70 : 1,937.88 = 551.34 : x
  2. Step 2: Convert to fraction form
    1,291.70/1,937.88 = 551.34/x
  3. Step 3: Cross multiply
    1,291.70x = 1,937.88 × 551.34
  4. Step 4: Simplify right side
    1,291.70x = 1,068,430.76
  5. Step 5: Solve for x
    x = 1,068,430.76/1,291.70
  6. Step 6: Final answer
    x = 827.15

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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.