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Finding the Fourth Proportional to 859.72, 1,186.38 and 486.72

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Solution

The fourth proportional to 859.72, 1,186.38 and 486.72 is: 671.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.72 : 1,186.38 = 486.72 : x
  2. Step 2: Convert to fraction form
    859.72/1,186.38 = 486.72/x
  3. Step 3: Cross multiply
    859.72x = 1,186.38 × 486.72
  4. Step 4: Simplify right side
    859.72x = 577,434.87
  5. Step 5: Solve for x
    x = 577,434.87/859.72
  6. Step 6: Final answer
    x = 671.65

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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.