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Finding the Fourth Proportional to 940.64, 1,410.86 and 392.66

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Solution

The fourth proportional to 940.64, 1,410.86 and 392.66 is: 588.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.64 : 1,410.86 = 392.66 : x
  2. Step 2: Convert to fraction form
    940.64/1,410.86 = 392.66/x
  3. Step 3: Cross multiply
    940.64x = 1,410.86 × 392.66
  4. Step 4: Simplify right side
    940.64x = 553,988.29
  5. Step 5: Solve for x
    x = 553,988.29/940.64
  6. Step 6: Final answer
    x = 588.95

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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.