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Finding the Fourth Proportional to 991.45, 1,368.50 and 730.22

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Solution

The fourth proportional to 991.45, 1,368.50 and 730.22 is: 1,007.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.45 : 1,368.50 = 730.22 : x
  2. Step 2: Convert to fraction form
    991.45/1,368.50 = 730.22/x
  3. Step 3: Cross multiply
    991.45x = 1,368.50 × 730.22
  4. Step 4: Simplify right side
    991.45x = 999,302.42
  5. Step 5: Solve for x
    x = 999,302.42/991.45
  6. Step 6: Final answer
    x = 1,007.93

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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.