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Finding the Fourth Proportional to 458.36, 688.56 and 429.20

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Solution

The fourth proportional to 458.36, 688.56 and 429.20 is: 644.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.36 : 688.56 = 429.20 : x
  2. Step 2: Convert to fraction form
    458.36/688.56 = 429.20/x
  3. Step 3: Cross multiply
    458.36x = 688.56 × 429.20
  4. Step 4: Simplify right side
    458.36x = 295,530.50
  5. Step 5: Solve for x
    x = 295,530.50/458.36
  6. Step 6: Final answer
    x = 644.76

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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.