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Finding the Fourth Proportional to 859.51, 1,186.11 and 486.49

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Solution

The fourth proportional to 859.51, 1,186.11 and 486.49 is: 671.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.51 : 1,186.11 = 486.49 : x
  2. Step 2: Convert to fraction form
    859.51/1,186.11 = 486.49/x
  3. Step 3: Cross multiply
    859.51x = 1,186.11 × 486.49
  4. Step 4: Simplify right side
    859.51x = 577,030.65
  5. Step 5: Solve for x
    x = 577,030.65/859.51
  6. Step 6: Final answer
    x = 671.35

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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.