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Finding the Fourth Proportional to 1,359.52, 1,876.79 and 919.73

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Solution

The fourth proportional to 1,359.52, 1,876.79 and 919.73 is: 1,269.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,359.52 : 1,876.79 = 919.73 : x
  2. Step 2: Convert to fraction form
    1,359.52/1,876.79 = 919.73/x
  3. Step 3: Cross multiply
    1,359.52x = 1,876.79 × 919.73
  4. Step 4: Simplify right side
    1,359.52x = 1,726,126.08
  5. Step 5: Solve for x
    x = 1,726,126.08/1,359.52
  6. Step 6: Final answer
    x = 1,269.66

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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.