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Finding the Fourth Proportional to 992.80, 1,368.72 and 730.36

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Solution

The fourth proportional to 992.80, 1,368.72 and 730.36 is: 1,006.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.80 : 1,368.72 = 730.36 : x
  2. Step 2: Convert to fraction form
    992.80/1,368.72 = 730.36/x
  3. Step 3: Cross multiply
    992.80x = 1,368.72 × 730.36
  4. Step 4: Simplify right side
    992.80x = 999,658.34
  5. Step 5: Solve for x
    x = 999,658.34/992.80
  6. Step 6: Final answer
    x = 1,006.91

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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.