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Finding the Fourth Proportional to 714.70, 986.16 and 404.20

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Solution

The fourth proportional to 714.70, 986.16 and 404.20 is: 557.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.70 : 986.16 = 404.20 : x
  2. Step 2: Convert to fraction form
    714.70/986.16 = 404.20/x
  3. Step 3: Cross multiply
    714.70x = 986.16 × 404.20
  4. Step 4: Simplify right side
    714.70x = 398,605.87
  5. Step 5: Solve for x
    x = 398,605.87/714.70
  6. Step 6: Final answer
    x = 557.72

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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.