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Finding the Fourth Proportional to 1,292.17, 1,939.23 and 946.39

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Solution

The fourth proportional to 1,292.17, 1,939.23 and 946.39 is: 1,420.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.17 : 1,939.23 = 946.39 : x
  2. Step 2: Convert to fraction form
    1,292.17/1,939.23 = 946.39/x
  3. Step 3: Cross multiply
    1,292.17x = 1,939.23 × 946.39
  4. Step 4: Simplify right side
    1,292.17x = 1,835,262.61
  5. Step 5: Solve for x
    x = 1,835,262.61/1,292.17
  6. Step 6: Final answer
    x = 1,420.30

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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.