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Finding the Fourth Proportional to 1,291.49, 1,781.57 and 897.83

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Solution

The fourth proportional to 1,291.49, 1,781.57 and 897.83 is: 1,238.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.49 : 1,781.57 = 897.83 : x
  2. Step 2: Convert to fraction form
    1,291.49/1,781.57 = 897.83/x
  3. Step 3: Cross multiply
    1,291.49x = 1,781.57 × 897.83
  4. Step 4: Simplify right side
    1,291.49x = 1,599,542.50
  5. Step 5: Solve for x
    x = 1,599,542.50/1,291.49
  6. Step 6: Final answer
    x = 1,238.52

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1.5x scale

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.