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Finding the Fourth Proportional to 713.89, 985.16 and 419.11

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Solution

The fourth proportional to 713.89, 985.16 and 419.11 is: 578.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.89 : 985.16 = 419.11 : x
  2. Step 2: Convert to fraction form
    713.89/985.16 = 419.11/x
  3. Step 3: Cross multiply
    713.89x = 985.16 × 419.11
  4. Step 4: Simplify right side
    713.89x = 412,885.48
  5. Step 5: Solve for x
    x = 412,885.48/713.89
  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.