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Finding the Fourth Proportional to 901.53, 1,243.54 and 691.36

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Solution

The fourth proportional to 901.53, 1,243.54 and 691.36 is: 953.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.53 : 1,243.54 = 691.36 : x
  2. Step 2: Convert to fraction form
    901.53/1,243.54 = 691.36/x
  3. Step 3: Cross multiply
    901.53x = 1,243.54 × 691.36
  4. Step 4: Simplify right side
    901.53x = 859,733.81
  5. Step 5: Solve for x
    x = 859,733.81/901.53
  6. Step 6: Final answer
    x = 953.64

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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.