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Finding the Fourth Proportional to 713.78, 985.04 and 419.06

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Solution

The fourth proportional to 713.78, 985.04 and 419.06 is: 578.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.78 : 985.04 = 419.06 : x
  2. Step 2: Convert to fraction form
    713.78/985.04 = 419.06/x
  3. Step 3: Cross multiply
    713.78x = 985.04 × 419.06
  4. Step 4: Simplify right side
    713.78x = 412,790.86
  5. Step 5: Solve for x
    x = 412,790.86/713.78
  6. Step 6: Final answer
    x = 578.32

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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.