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Finding the Fourth Proportional to 1,290.88, 1,935.42 and 510.31

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Solution

The fourth proportional to 1,290.88, 1,935.42 and 510.31 is: 765.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.88 : 1,935.42 = 510.31 : x
  2. Step 2: Convert to fraction form
    1,290.88/1,935.42 = 510.31/x
  3. Step 3: Cross multiply
    1,290.88x = 1,935.42 × 510.31
  4. Step 4: Simplify right side
    1,290.88x = 987,664.18
  5. Step 5: Solve for x
    x = 987,664.18/1,290.88
  6. Step 6: Final answer
    x = 765.11

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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.