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Finding the Fourth Proportional to 711.39, 981.72 and 392.37

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Solution

The fourth proportional to 711.39, 981.72 and 392.37 is: 541.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.39 : 981.72 = 392.37 : x
  2. Step 2: Convert to fraction form
    711.39/981.72 = 392.37/x
  3. Step 3: Cross multiply
    711.39x = 981.72 × 392.37
  4. Step 4: Simplify right side
    711.39x = 385,197.48
  5. Step 5: Solve for x
    x = 385,197.48/711.39
  6. Step 6: Final answer
    x = 541.47

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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.