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Finding the Fourth Proportional to 840.17, 1,255.62 and 621.26

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Solution

The fourth proportional to 840.17, 1,255.62 and 621.26 is: 928.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.17 : 1,255.62 = 621.26 : x
  2. Step 2: Convert to fraction form
    840.17/1,255.62 = 621.26/x
  3. Step 3: Cross multiply
    840.17x = 1,255.62 × 621.26
  4. Step 4: Simplify right side
    840.17x = 780,063.37
  5. Step 5: Solve for x
    x = 780,063.37/840.17
  6. Step 6: Final answer
    x = 928.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.