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Finding the Fourth Proportional to 435.45, 653.54 and 390.09

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Solution

The fourth proportional to 435.45, 653.54 and 390.09 is: 585.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    435.45 : 653.54 = 390.09 : x
  2. Step 2: Convert to fraction form
    435.45/653.54 = 390.09/x
  3. Step 3: Cross multiply
    435.45x = 653.54 × 390.09
  4. Step 4: Simplify right side
    435.45x = 254,937.47
  5. Step 5: Solve for x
    x = 254,937.47/435.45
  6. Step 6: Final answer
    x = 585.46

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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.