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Finding the Fourth Proportional to 860.07, 1,186.76 and 487.00

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Solution

The fourth proportional to 860.07, 1,186.76 and 487.00 is: 671.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.07 : 1,186.76 = 487.00 : x
  2. Step 2: Convert to fraction form
    860.07/1,186.76 = 487.00/x
  3. Step 3: Cross multiply
    860.07x = 1,186.76 × 487.00
  4. Step 4: Simplify right side
    860.07x = 577,943.75
  5. Step 5: Solve for x
    x = 577,943.75/860.07
  6. Step 6: Final answer
    x = 671.97

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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.