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Finding the Fourth Proportional to 438.44, 655.71 and 390.02

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Solution

The fourth proportional to 438.44, 655.71 and 390.02 is: 583.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.44 : 655.71 = 390.02 : x
  2. Step 2: Convert to fraction form
    438.44/655.71 = 390.02/x
  3. Step 3: Cross multiply
    438.44x = 655.71 × 390.02
  4. Step 4: Simplify right side
    438.44x = 255,741.65
  5. Step 5: Solve for x
    x = 255,741.65/438.44
  6. Step 6: Final answer
    x = 583.31

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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.