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Finding the Fourth Proportional to 711.02, 981.39 and 637.21

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Solution

The fourth proportional to 711.02, 981.39 and 637.21 is: 879.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.02 : 981.39 = 637.21 : x
  2. Step 2: Convert to fraction form
    711.02/981.39 = 637.21/x
  3. Step 3: Cross multiply
    711.02x = 981.39 × 637.21
  4. Step 4: Simplify right side
    711.02x = 625,349.07
  5. Step 5: Solve for x
    x = 625,349.07/711.02
  6. Step 6: Final answer
    x = 879.51

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Double scale
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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.