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Finding the Fourth Proportional to 945.78, 1,418.54 and 458.70

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Solution

The fourth proportional to 945.78, 1,418.54 and 458.70 is: 687.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.78 : 1,418.54 = 458.70 : x
  2. Step 2: Convert to fraction form
    945.78/1,418.54 = 458.70/x
  3. Step 3: Cross multiply
    945.78x = 1,418.54 × 458.70
  4. Step 4: Simplify right side
    945.78x = 650,682.00
  5. Step 5: Solve for x
    x = 650,682.00/945.78
  6. Step 6: Final answer
    x = 687.98

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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.