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Finding the Fourth Proportional to 714.60, 985.85 and 419.75

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Solution

The fourth proportional to 714.60, 985.85 and 419.75 is: 579.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.60 : 985.85 = 419.75 : x
  2. Step 2: Convert to fraction form
    714.60/985.85 = 419.75/x
  3. Step 3: Cross multiply
    714.60x = 985.85 × 419.75
  4. Step 4: Simplify right side
    714.60x = 413,803.51
  5. Step 5: Solve for x
    x = 413,803.51/714.60
  6. Step 6: Final answer
    x = 579.07

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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.