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Finding the Fourth Proportional to 713.83, 985.11 and 419.09

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Solution

The fourth proportional to 713.83, 985.11 and 419.09 is: 578.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.83 : 985.11 = 419.09 : x
  2. Step 2: Convert to fraction form
    713.83/985.11 = 419.09/x
  3. Step 3: Cross multiply
    713.83x = 985.11 × 419.09
  4. Step 4: Simplify right side
    713.83x = 412,852.21
  5. Step 5: Solve for x
    x = 412,852.21/713.83
  6. Step 6: Final answer
    x = 578.36

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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.