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Finding the Fourth Proportional to 437.33, 656.39 and 390.99

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Solution

The fourth proportional to 437.33, 656.39 and 390.99 is: 586.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    437.33 : 656.39 = 390.99 : x
  2. Step 2: Convert to fraction form
    437.33/656.39 = 390.99/x
  3. Step 3: Cross multiply
    437.33x = 656.39 × 390.99
  4. Step 4: Simplify right side
    437.33x = 256,639.97
  5. Step 5: Solve for x
    x = 256,639.97/437.33
  6. Step 6: Final answer
    x = 586.84

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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.