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Finding the Fourth Proportional to 655.10, 904.10 and 389.61

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Solution

The fourth proportional to 655.10, 904.10 and 389.61 is: 537.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.10 : 904.10 = 389.61 : x
  2. Step 2: Convert to fraction form
    655.10/904.10 = 389.61/x
  3. Step 3: Cross multiply
    655.10x = 904.10 × 389.61
  4. Step 4: Simplify right side
    655.10x = 352,244.45
  5. Step 5: Solve for x
    x = 352,244.45/655.10
  6. Step 6: Final answer
    x = 537.70

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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.