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Finding the Fourth Proportional to 1,018.80, 1,528.88 and 402.43

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Solution

The fourth proportional to 1,018.80, 1,528.88 and 402.43 is: 603.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.80 : 1,528.88 = 402.43 : x
  2. Step 2: Convert to fraction form
    1,018.80/1,528.88 = 402.43/x
  3. Step 3: Cross multiply
    1,018.80x = 1,528.88 × 402.43
  4. Step 4: Simplify right side
    1,018.80x = 615,267.18
  5. Step 5: Solve for x
    x = 615,267.18/1,018.80
  6. Step 6: Final answer
    x = 603.91

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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.