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Finding the Fourth Proportional to 714.92, 986.61 and 420.13

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Solution

The fourth proportional to 714.92, 986.61 and 420.13 is: 579.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.92 : 986.61 = 420.13 : x
  2. Step 2: Convert to fraction form
    714.92/986.61 = 420.13/x
  3. Step 3: Cross multiply
    714.92x = 986.61 × 420.13
  4. Step 4: Simplify right side
    714.92x = 414,504.46
  5. Step 5: Solve for x
    x = 414,504.46/714.92
  6. Step 6: Final answer
    x = 579.79

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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.