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Finding the Fourth Proportional to 860.74, 1,187.88 and 482.66

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Solution

The fourth proportional to 860.74, 1,187.88 and 482.66 is: 666.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.74 : 1,187.88 = 482.66 : x
  2. Step 2: Convert to fraction form
    860.74/1,187.88 = 482.66/x
  3. Step 3: Cross multiply
    860.74x = 1,187.88 × 482.66
  4. Step 4: Simplify right side
    860.74x = 573,342.16
  5. Step 5: Solve for x
    x = 573,342.16/860.74
  6. Step 6: Final answer
    x = 666.10

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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.