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Finding the Fourth Proportional to 1,007.78, 1,512.70 and 521.18

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Solution

The fourth proportional to 1,007.78, 1,512.70 and 521.18 is: 782.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.78 : 1,512.70 = 521.18 : x
  2. Step 2: Convert to fraction form
    1,007.78/1,512.70 = 521.18/x
  3. Step 3: Cross multiply
    1,007.78x = 1,512.70 × 521.18
  4. Step 4: Simplify right side
    1,007.78x = 788,388.99
  5. Step 5: Solve for x
    x = 788,388.99/1,007.78
  6. Step 6: Final answer
    x = 782.30

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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.