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Finding the Fourth Proportional to 992.52, 1,368.36 and 660.15

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Solution

The fourth proportional to 992.52, 1,368.36 and 660.15 is: 910.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.52 : 1,368.36 = 660.15 : x
  2. Step 2: Convert to fraction form
    992.52/1,368.36 = 660.15/x
  3. Step 3: Cross multiply
    992.52x = 1,368.36 × 660.15
  4. Step 4: Simplify right side
    992.52x = 903,322.85
  5. Step 5: Solve for x
    x = 903,322.85/992.52
  6. Step 6: Final answer
    x = 910.13

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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.