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Finding the Fourth Proportional to 713.79, 984.08 and 640.89

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Solution

The fourth proportional to 713.79, 984.08 and 640.89 is: 883.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.79 : 984.08 = 640.89 : x
  2. Step 2: Convert to fraction form
    713.79/984.08 = 640.89/x
  3. Step 3: Cross multiply
    713.79x = 984.08 × 640.89
  4. Step 4: Simplify right side
    713.79x = 630,687.03
  5. Step 5: Solve for x
    x = 630,687.03/713.79
  6. Step 6: Final answer
    x = 883.58

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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.