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Finding the Fourth Proportional to 711.55, 981.95 and 401.05

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Solution

The fourth proportional to 711.55, 981.95 and 401.05 is: 553.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.55 : 981.95 = 401.05 : x
  2. Step 2: Convert to fraction form
    711.55/981.95 = 401.05/x
  3. Step 3: Cross multiply
    711.55x = 981.95 × 401.05
  4. Step 4: Simplify right side
    711.55x = 393,811.05
  5. Step 5: Solve for x
    x = 393,811.05/711.55
  6. Step 6: Final answer
    x = 553.46

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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.