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Finding the Fourth Proportional to 901.01, 1,243.40 and 551.63

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Solution

The fourth proportional to 901.01, 1,243.40 and 551.63 is: 761.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.01 : 1,243.40 = 551.63 : x
  2. Step 2: Convert to fraction form
    901.01/1,243.40 = 551.63/x
  3. Step 3: Cross multiply
    901.01x = 1,243.40 × 551.63
  4. Step 4: Simplify right side
    901.01x = 685,896.74
  5. Step 5: Solve for x
    x = 685,896.74/901.01
  6. Step 6: Final answer
    x = 761.25

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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.