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Finding the Fourth Proportional to 713.64, 985.14 and 418.92

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Solution

The fourth proportional to 713.64, 985.14 and 418.92 is: 578.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.64 : 985.14 = 418.92 : x
  2. Step 2: Convert to fraction form
    713.64/985.14 = 418.92/x
  3. Step 3: Cross multiply
    713.64x = 985.14 × 418.92
  4. Step 4: Simplify right side
    713.64x = 412,695.52
  5. Step 5: Solve for x
    x = 412,695.52/713.64
  6. Step 6: Final answer
    x = 578.30

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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.