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Finding the Fourth Proportional to 840.99, 1,257.89 and 607.26

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Solution

The fourth proportional to 840.99, 1,257.89 and 607.26 is: 908.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.99 : 1,257.89 = 607.26 : x
  2. Step 2: Convert to fraction form
    840.99/1,257.89 = 607.26/x
  3. Step 3: Cross multiply
    840.99x = 1,257.89 × 607.26
  4. Step 4: Simplify right side
    840.99x = 763,866.28
  5. Step 5: Solve for x
    x = 763,866.28/840.99
  6. Step 6: Final answer
    x = 908.29

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Double scale
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1.5x scale

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.