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Finding the Fourth Proportional to 802.10, 1,105.81 and 661.70

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Solution

The fourth proportional to 802.10, 1,105.81 and 661.70 is: 912.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.10 : 1,105.81 = 661.70 : x
  2. Step 2: Convert to fraction form
    802.10/1,105.81 = 661.70/x
  3. Step 3: Cross multiply
    802.10x = 1,105.81 × 661.70
  4. Step 4: Simplify right side
    802.10x = 731,707.29
  5. Step 5: Solve for x
    x = 731,707.29/802.10
  6. Step 6: Final answer
    x = 912.25

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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.