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Finding the Fourth Proportional to 714.16, 985.64 and 419.46

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Solution

The fourth proportional to 714.16, 985.64 and 419.46 is: 578.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.16 : 985.64 = 419.46 : x
  2. Step 2: Convert to fraction form
    714.16/985.64 = 419.46/x
  3. Step 3: Cross multiply
    714.16x = 985.64 × 419.46
  4. Step 4: Simplify right side
    714.16x = 413,436.55
  5. Step 5: Solve for x
    x = 413,436.55/714.16
  6. Step 6: Final answer
    x = 578.91

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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.