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Finding the Fourth Proportional to 487.15, 730.45 and 429.51

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Solution

The fourth proportional to 487.15, 730.45 and 429.51 is: 644.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.15 : 730.45 = 429.51 : x
  2. Step 2: Convert to fraction form
    487.15/730.45 = 429.51/x
  3. Step 3: Cross multiply
    487.15x = 730.45 × 429.51
  4. Step 4: Simplify right side
    487.15x = 313,735.58
  5. Step 5: Solve for x
    x = 313,735.58/487.15
  6. Step 6: Final answer
    x = 644.02

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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.