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Finding the Fourth Proportional to 635.64, 881.67 and 618.78

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Solution

The fourth proportional to 635.64, 881.67 and 618.78 is: 858.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.64 : 881.67 = 618.78 : x
  2. Step 2: Convert to fraction form
    635.64/881.67 = 618.78/x
  3. Step 3: Cross multiply
    635.64x = 881.67 × 618.78
  4. Step 4: Simplify right side
    635.64x = 545,552.26
  5. Step 5: Solve for x
    x = 545,552.26/635.64
  6. Step 6: Final answer
    x = 858.28

Related Problems

Find fourth proportional to 317.82, 440.83 and 309.39
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 (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.