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Finding the Fourth Proportional to 855.24, 1,180.78 and 556.76

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Solution

The fourth proportional to 855.24, 1,180.78 and 556.76 is: 768.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.24 : 1,180.78 = 556.76 : x
  2. Step 2: Convert to fraction form
    855.24/1,180.78 = 556.76/x
  3. Step 3: Cross multiply
    855.24x = 1,180.78 × 556.76
  4. Step 4: Simplify right side
    855.24x = 657,411.07
  5. Step 5: Solve for x
    x = 657,411.07/855.24
  6. Step 6: Final answer
    x = 768.69

Related Problems

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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.