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Finding the Fourth Proportional to 940.61, 1,411.12 and 392.78

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Solution

The fourth proportional to 940.61, 1,411.12 and 392.78 is: 589.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.61 : 1,411.12 = 392.78 : x
  2. Step 2: Convert to fraction form
    940.61/1,411.12 = 392.78/x
  3. Step 3: Cross multiply
    940.61x = 1,411.12 × 392.78
  4. Step 4: Simplify right side
    940.61x = 554,263.73
  5. Step 5: Solve for x
    x = 554,263.73/940.61
  6. Step 6: Final answer
    x = 589.26

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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.