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Finding the Fourth Proportional to 860.92, 1,188.12 and 581.20

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Solution

The fourth proportional to 860.92, 1,188.12 and 581.20 is: 802.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.92 : 1,188.12 = 581.20 : x
  2. Step 2: Convert to fraction form
    860.92/1,188.12 = 581.20/x
  3. Step 3: Cross multiply
    860.92x = 1,188.12 × 581.20
  4. Step 4: Simplify right side
    860.92x = 690,535.34
  5. Step 5: Solve for x
    x = 690,535.34/860.92
  6. Step 6: Final answer
    x = 802.09

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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.