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Finding the Fourth Proportional to 438.64, 657.15 and 390.04

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Solution

The fourth proportional to 438.64, 657.15 and 390.04 is: 584.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.64 : 657.15 = 390.04 : x
  2. Step 2: Convert to fraction form
    438.64/657.15 = 390.04/x
  3. Step 3: Cross multiply
    438.64x = 657.15 × 390.04
  4. Step 4: Simplify right side
    438.64x = 256,314.79
  5. Step 5: Solve for x
    x = 256,314.79/438.64
  6. Step 6: Final answer
    x = 584.34

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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.