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Finding the Fourth Proportional to 860.18, 1,187.28 and 528.56

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Solution

The fourth proportional to 860.18, 1,187.28 and 528.56 is: 729.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.18 : 1,187.28 = 528.56 : x
  2. Step 2: Convert to fraction form
    860.18/1,187.28 = 528.56/x
  3. Step 3: Cross multiply
    860.18x = 1,187.28 × 528.56
  4. Step 4: Simplify right side
    860.18x = 627,548.72
  5. Step 5: Solve for x
    x = 627,548.72/860.18
  6. Step 6: Final answer
    x = 729.56

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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.