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Finding the Fourth Proportional to 860.66, 1,187.76 and 581.45

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Solution

The fourth proportional to 860.66, 1,187.76 and 581.45 is: 802.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.66 : 1,187.76 = 581.45 : x
  2. Step 2: Convert to fraction form
    860.66/1,187.76 = 581.45/x
  3. Step 3: Cross multiply
    860.66x = 1,187.76 × 581.45
  4. Step 4: Simplify right side
    860.66x = 690,619.29
  5. Step 5: Solve for x
    x = 690,619.29/860.66
  6. Step 6: Final answer
    x = 802.43

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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.