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Finding the Fourth Proportional to 1,291.76, 1,937.74 and 469.70

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Solution

The fourth proportional to 1,291.76, 1,937.74 and 469.70 is: 704.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.76 : 1,937.74 = 469.70 : x
  2. Step 2: Convert to fraction form
    1,291.76/1,937.74 = 469.70/x
  3. Step 3: Cross multiply
    1,291.76x = 1,937.74 × 469.70
  4. Step 4: Simplify right side
    1,291.76x = 910,156.48
  5. Step 5: Solve for x
    x = 910,156.48/1,291.76
  6. Step 6: Final answer
    x = 704.59

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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.