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Finding the Fourth Proportional to 713.82, 985.32 and 419.22

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Solution

The fourth proportional to 713.82, 985.32 and 419.22 is: 578.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.82 : 985.32 = 419.22 : x
  2. Step 2: Convert to fraction form
    713.82/985.32 = 419.22/x
  3. Step 3: Cross multiply
    713.82x = 985.32 × 419.22
  4. Step 4: Simplify right side
    713.82x = 413,065.85
  5. Step 5: Solve for x
    x = 413,065.85/713.82
  6. Step 6: Final answer
    x = 578.67

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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.