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Finding the Fourth Proportional to 713.45, 984.38 and 418.70

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Solution

The fourth proportional to 713.45, 984.38 and 418.70 is: 577.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.45 : 984.38 = 418.70 : x
  2. Step 2: Convert to fraction form
    713.45/984.38 = 418.70/x
  3. Step 3: Cross multiply
    713.45x = 984.38 × 418.70
  4. Step 4: Simplify right side
    713.45x = 412,152.89
  5. Step 5: Solve for x
    x = 412,152.89/713.45
  6. Step 6: Final answer
    x = 577.69

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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.