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Finding the Fourth Proportional to 655.44, 910.78 and 647.28

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Solution

The fourth proportional to 655.44, 910.78 and 647.28 is: 899.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.44 : 910.78 = 647.28 : x
  2. Step 2: Convert to fraction form
    655.44/910.78 = 647.28/x
  3. Step 3: Cross multiply
    655.44x = 910.78 × 647.28
  4. Step 4: Simplify right side
    655.44x = 589,529.68
  5. Step 5: Solve for x
    x = 589,529.68/655.44
  6. Step 6: Final answer
    x = 899.44

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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.