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Finding the Fourth Proportional to 458.80, 686.40 and 415.60

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Solution

The fourth proportional to 458.80, 686.40 and 415.60 is: 621.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.80 : 686.40 = 415.60 : x
  2. Step 2: Convert to fraction form
    458.80/686.40 = 415.60/x
  3. Step 3: Cross multiply
    458.80x = 686.40 × 415.60
  4. Step 4: Simplify right side
    458.80x = 285,267.84
  5. Step 5: Solve for x
    x = 285,267.84/458.80
  6. Step 6: Final answer
    x = 621.77

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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.