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Finding the Fourth Proportional to 653.25, 901.38 and 387.70

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Solution

The fourth proportional to 653.25, 901.38 and 387.70 is: 534.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.25 : 901.38 = 387.70 : x
  2. Step 2: Convert to fraction form
    653.25/901.38 = 387.70/x
  3. Step 3: Cross multiply
    653.25x = 901.38 × 387.70
  4. Step 4: Simplify right side
    653.25x = 349,465.03
  5. Step 5: Solve for x
    x = 349,465.03/653.25
  6. Step 6: Final answer
    x = 534.96

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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.