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Finding the Fourth Proportional to 618.75, 855.09 and 553.14

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Solution

The fourth proportional to 618.75, 855.09 and 553.14 is: 764.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.75 : 855.09 = 553.14 : x
  2. Step 2: Convert to fraction form
    618.75/855.09 = 553.14/x
  3. Step 3: Cross multiply
    618.75x = 855.09 × 553.14
  4. Step 4: Simplify right side
    618.75x = 472,984.48
  5. Step 5: Solve for x
    x = 472,984.48/618.75
  6. Step 6: Final answer
    x = 764.42

Related Problems

Find fourth proportional to 309.38, 427.55 and 276.57
Half scale
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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.