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Finding the Fourth Proportional to 664.60, 916.20 and 478.03

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Solution

The fourth proportional to 664.60, 916.20 and 478.03 is: 659.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.60 : 916.20 = 478.03 : x
  2. Step 2: Convert to fraction form
    664.60/916.20 = 478.03/x
  3. Step 3: Cross multiply
    664.60x = 916.20 × 478.03
  4. Step 4: Simplify right side
    664.60x = 437,968.80
  5. Step 5: Solve for x
    x = 437,968.80/664.60
  6. Step 6: Final answer
    x = 659.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.