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Finding the Fourth Proportional to 859.77, 1,186.59 and 486.75

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Solution

The fourth proportional to 859.77, 1,186.59 and 486.75 is: 671.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.77 : 1,186.59 = 486.75 : x
  2. Step 2: Convert to fraction form
    859.77/1,186.59 = 486.75/x
  3. Step 3: Cross multiply
    859.77x = 1,186.59 × 486.75
  4. Step 4: Simplify right side
    859.77x = 577,572.68
  5. Step 5: Solve for x
    x = 577,572.68/859.77
  6. Step 6: Final answer
    x = 671.78

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.