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Finding the Fourth Proportional to 1,291.47, 1,783.70 and 871.10

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Solution

The fourth proportional to 1,291.47, 1,783.70 and 871.10 is: 1,203.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.47 : 1,783.70 = 871.10 : x
  2. Step 2: Convert to fraction form
    1,291.47/1,783.70 = 871.10/x
  3. Step 3: Cross multiply
    1,291.47x = 1,783.70 × 871.10
  4. Step 4: Simplify right side
    1,291.47x = 1,553,781.07
  5. Step 5: Solve for x
    x = 1,553,781.07/1,291.47
  6. Step 6: Final answer
    x = 1,203.11

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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.