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Finding the Fourth Proportional to 840.87, 1,160.73 and 579.78

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Solution

The fourth proportional to 840.87, 1,160.73 and 579.78 is: 800.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.87 : 1,160.73 = 579.78 : x
  2. Step 2: Convert to fraction form
    840.87/1,160.73 = 579.78/x
  3. Step 3: Cross multiply
    840.87x = 1,160.73 × 579.78
  4. Step 4: Simplify right side
    840.87x = 672,968.04
  5. Step 5: Solve for x
    x = 672,968.04/840.87
  6. Step 6: Final answer
    x = 800.32

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Double scale
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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.