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Finding the Fourth Proportional to 901.78, 1,351.70 and 438.53

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Solution

The fourth proportional to 901.78, 1,351.70 and 438.53 is: 657.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.78 : 1,351.70 = 438.53 : x
  2. Step 2: Convert to fraction form
    901.78/1,351.70 = 438.53/x
  3. Step 3: Cross multiply
    901.78x = 1,351.70 × 438.53
  4. Step 4: Simplify right side
    901.78x = 592,761.00
  5. Step 5: Solve for x
    x = 592,761.00/901.78
  6. Step 6: Final answer
    x = 657.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.