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Finding the Fourth Proportional to 901.19, 1,243.64 and 551.88

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Solution

The fourth proportional to 901.19, 1,243.64 and 551.88 is: 761.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.19 : 1,243.64 = 551.88 : x
  2. Step 2: Convert to fraction form
    901.19/1,243.64 = 551.88/x
  3. Step 3: Cross multiply
    901.19x = 1,243.64 × 551.88
  4. Step 4: Simplify right side
    901.19x = 686,333.14
  5. Step 5: Solve for x
    x = 686,333.14/901.19
  6. Step 6: Final answer
    x = 761.59

Related Problems

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Half scale
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Double scale
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1.5x scale

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.