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Finding the Fourth Proportional to 989.91, 1,364.95 and 674.52

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Solution

The fourth proportional to 989.91, 1,364.95 and 674.52 is: 930.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.91 : 1,364.95 = 674.52 : x
  2. Step 2: Convert to fraction form
    989.91/1,364.95 = 674.52/x
  3. Step 3: Cross multiply
    989.91x = 1,364.95 × 674.52
  4. Step 4: Simplify right side
    989.91x = 920,686.07
  5. Step 5: Solve for x
    x = 920,686.07/989.91
  6. Step 6: Final answer
    x = 930.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.