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Finding the Fourth Proportional to 991.92, 1,368.90 and 598.96

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Solution

The fourth proportional to 991.92, 1,368.90 and 598.96 is: 826.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.92 : 1,368.90 = 598.96 : x
  2. Step 2: Convert to fraction form
    991.92/1,368.90 = 598.96/x
  3. Step 3: Cross multiply
    991.92x = 1,368.90 × 598.96
  4. Step 4: Simplify right side
    991.92x = 819,916.34
  5. Step 5: Solve for x
    x = 819,916.34/991.92
  6. Step 6: Final answer
    x = 826.60

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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.