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Finding the Fourth Proportional to 1,285.66, 1,774.38 and 726.25

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Solution

The fourth proportional to 1,285.66, 1,774.38 and 726.25 is: 1,002.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.66 : 1,774.38 = 726.25 : x
  2. Step 2: Convert to fraction form
    1,285.66/1,774.38 = 726.25/x
  3. Step 3: Cross multiply
    1,285.66x = 1,774.38 × 726.25
  4. Step 4: Simplify right side
    1,285.66x = 1,288,643.48
  5. Step 5: Solve for x
    x = 1,288,643.48/1,285.66
  6. Step 6: Final answer
    x = 1,002.32

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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.