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Finding the Fourth Proportional to 711.58, 981.90 and 416.90

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Solution

The fourth proportional to 711.58, 981.90 and 416.90 is: 575.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.58 : 981.90 = 416.90 : x
  2. Step 2: Convert to fraction form
    711.58/981.90 = 416.90/x
  3. Step 3: Cross multiply
    711.58x = 981.90 × 416.90
  4. Step 4: Simplify right side
    711.58x = 409,354.11
  5. Step 5: Solve for x
    x = 409,354.11/711.58
  6. Step 6: Final answer
    x = 575.27

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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.