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Finding the Fourth Proportional to 1,019.76, 1,528.80 and 857.28

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Solution

The fourth proportional to 1,019.76, 1,528.80 and 857.28 is: 1,285.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.76 : 1,528.80 = 857.28 : x
  2. Step 2: Convert to fraction form
    1,019.76/1,528.80 = 857.28/x
  3. Step 3: Cross multiply
    1,019.76x = 1,528.80 × 857.28
  4. Step 4: Simplify right side
    1,019.76x = 1,310,609.66
  5. Step 5: Solve for x
    x = 1,310,609.66/1,019.76
  6. Step 6: Final answer
    x = 1,285.21

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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.