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Finding the Fourth Proportional to 926.58, 1,390.85 and 905.66

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Solution

The fourth proportional to 926.58, 1,390.85 and 905.66 is: 1,359.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.58 : 1,390.85 = 905.66 : x
  2. Step 2: Convert to fraction form
    926.58/1,390.85 = 905.66/x
  3. Step 3: Cross multiply
    926.58x = 1,390.85 × 905.66
  4. Step 4: Simplify right side
    926.58x = 1,259,632.68
  5. Step 5: Solve for x
    x = 1,259,632.68/926.58
  6. Step 6: Final answer
    x = 1,359.45

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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.