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Finding the Fourth Proportional to 798.03, 1,098.90 and 666.81

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Solution

The fourth proportional to 798.03, 1,098.90 and 666.81 is: 918.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.03 : 1,098.90 = 666.81 : x
  2. Step 2: Convert to fraction form
    798.03/1,098.90 = 666.81/x
  3. Step 3: Cross multiply
    798.03x = 1,098.90 × 666.81
  4. Step 4: Simplify right side
    798.03x = 732,757.51
  5. Step 5: Solve for x
    x = 732,757.51/798.03
  6. Step 6: Final answer
    x = 918.21

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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.