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Finding the Fourth Proportional to 653.58, 901.90 and 391.44

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Solution

The fourth proportional to 653.58, 901.90 and 391.44 is: 540.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.58 : 901.90 = 391.44 : x
  2. Step 2: Convert to fraction form
    653.58/901.90 = 391.44/x
  3. Step 3: Cross multiply
    653.58x = 901.90 × 391.44
  4. Step 4: Simplify right side
    653.58x = 353,039.74
  5. Step 5: Solve for x
    x = 353,039.74/653.58
  6. Step 6: Final answer
    x = 540.16

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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.