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Finding the Fourth Proportional to 438.42, 604.35 and 313.86

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Solution

The fourth proportional to 438.42, 604.35 and 313.86 is: 432.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.42 : 604.35 = 313.86 : x
  2. Step 2: Convert to fraction form
    438.42/604.35 = 313.86/x
  3. Step 3: Cross multiply
    438.42x = 604.35 × 313.86
  4. Step 4: Simplify right side
    438.42x = 189,681.29
  5. Step 5: Solve for x
    x = 189,681.29/438.42
  6. Step 6: Final answer
    x = 432.65

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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.