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Finding the Fourth Proportional to 653.10, 901.35 and 391.18

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Solution

The fourth proportional to 653.10, 901.35 and 391.18 is: 539.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.10 : 901.35 = 391.18 : x
  2. Step 2: Convert to fraction form
    653.10/901.35 = 391.18/x
  3. Step 3: Cross multiply
    653.10x = 901.35 × 391.18
  4. Step 4: Simplify right side
    653.10x = 352,590.09
  5. Step 5: Solve for x
    x = 352,590.09/653.10
  6. Step 6: Final answer
    x = 539.87

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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.