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Finding the Fourth Proportional to 1,019.20, 1,528.42 and 556.34

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Solution

The fourth proportional to 1,019.20, 1,528.42 and 556.34 is: 834.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.20 : 1,528.42 = 556.34 : x
  2. Step 2: Convert to fraction form
    1,019.20/1,528.42 = 556.34/x
  3. Step 3: Cross multiply
    1,019.20x = 1,528.42 × 556.34
  4. Step 4: Simplify right side
    1,019.20x = 850,313.19
  5. Step 5: Solve for x
    x = 850,313.19/1,019.20
  6. Step 6: Final answer
    x = 834.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.