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Finding the Fourth Proportional to 521.77, 786.55 and 487.39

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Solution

The fourth proportional to 521.77, 786.55 and 487.39 is: 734.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.77 : 786.55 = 487.39 : x
  2. Step 2: Convert to fraction form
    521.77/786.55 = 487.39/x
  3. Step 3: Cross multiply
    521.77x = 786.55 × 487.39
  4. Step 4: Simplify right side
    521.77x = 383,356.60
  5. Step 5: Solve for x
    x = 383,356.60/521.77
  6. Step 6: Final answer
    x = 734.73

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.