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Finding the Fourth Proportional to 901.78, 1,243.65 and 802.90

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Solution

The fourth proportional to 901.78, 1,243.65 and 802.90 is: 1,107.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.78 : 1,243.65 = 802.90 : x
  2. Step 2: Convert to fraction form
    901.78/1,243.65 = 802.90/x
  3. Step 3: Cross multiply
    901.78x = 1,243.65 × 802.90
  4. Step 4: Simplify right side
    901.78x = 998,526.59
  5. Step 5: Solve for x
    x = 998,526.59/901.78
  6. Step 6: Final answer
    x = 1,107.28

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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.