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Finding the Fourth Proportional to 1,264.61, 1,897.11 and 386.91

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Solution

The fourth proportional to 1,264.61, 1,897.11 and 386.91 is: 580.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,264.61 : 1,897.11 = 386.91 : x
  2. Step 2: Convert to fraction form
    1,264.61/1,897.11 = 386.91/x
  3. Step 3: Cross multiply
    1,264.61x = 1,897.11 × 386.91
  4. Step 4: Simplify right side
    1,264.61x = 734,010.83
  5. Step 5: Solve for x
    x = 734,010.83/1,264.61
  6. Step 6: Final answer
    x = 580.43

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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.