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Finding the Fourth Proportional to 714.20, 985.66 and 419.32

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Solution

The fourth proportional to 714.20, 985.66 and 419.32 is: 578.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.20 : 985.66 = 419.32 : x
  2. Step 2: Convert to fraction form
    714.20/985.66 = 419.32/x
  3. Step 3: Cross multiply
    714.20x = 985.66 × 419.32
  4. Step 4: Simplify right side
    714.20x = 413,306.95
  5. Step 5: Solve for x
    x = 413,306.95/714.20
  6. Step 6: Final answer
    x = 578.70

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1.5x scale

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.