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Finding the Fourth Proportional to 501.76, 751.36 and 428.96

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Solution

The fourth proportional to 501.76, 751.36 and 428.96 is: 642.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.76 : 751.36 = 428.96 : x
  2. Step 2: Convert to fraction form
    501.76/751.36 = 428.96/x
  3. Step 3: Cross multiply
    501.76x = 751.36 × 428.96
  4. Step 4: Simplify right side
    501.76x = 322,303.39
  5. Step 5: Solve for x
    x = 322,303.39/501.76
  6. Step 6: Final answer
    x = 642.35

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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.