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Finding the Fourth Proportional to 1,290.99, 1,934.90 and 510.21

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Solution

The fourth proportional to 1,290.99, 1,934.90 and 510.21 is: 764.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.99 : 1,934.90 = 510.21 : x
  2. Step 2: Convert to fraction form
    1,290.99/1,934.90 = 510.21/x
  3. Step 3: Cross multiply
    1,290.99x = 1,934.90 × 510.21
  4. Step 4: Simplify right side
    1,290.99x = 987,193.10
  5. Step 5: Solve for x
    x = 987,193.10/1,290.99
  6. Step 6: Final answer
    x = 764.68

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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.