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Finding the Fourth Proportional to 480.08, 719.28 and 428.74

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Solution

The fourth proportional to 480.08, 719.28 and 428.74 is: 642.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.08 : 719.28 = 428.74 : x
  2. Step 2: Convert to fraction form
    480.08/719.28 = 428.74/x
  3. Step 3: Cross multiply
    480.08x = 719.28 × 428.74
  4. Step 4: Simplify right side
    480.08x = 308,386.35
  5. Step 5: Solve for x
    x = 308,386.35/480.08
  6. Step 6: Final answer
    x = 642.37

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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.