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Finding the Fourth Proportional to 425.95, 638.55 and 288.55

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Solution

The fourth proportional to 425.95, 638.55 and 288.55 is: 432.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.95 : 638.55 = 288.55 : x
  2. Step 2: Convert to fraction form
    425.95/638.55 = 288.55/x
  3. Step 3: Cross multiply
    425.95x = 638.55 × 288.55
  4. Step 4: Simplify right side
    425.95x = 184,253.60
  5. Step 5: Solve for x
    x = 184,253.60/425.95
  6. Step 6: Final answer
    x = 432.57

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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.