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Finding the Fourth Proportional to 714.94, 986.52 and 420.16

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Solution

The fourth proportional to 714.94, 986.52 and 420.16 is: 579.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.94 : 986.52 = 420.16 : x
  2. Step 2: Convert to fraction form
    714.94/986.52 = 420.16/x
  3. Step 3: Cross multiply
    714.94x = 986.52 × 420.16
  4. Step 4: Simplify right side
    714.94x = 414,496.24
  5. Step 5: Solve for x
    x = 414,496.24/714.94
  6. Step 6: Final answer
    x = 579.76

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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.