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Finding the Fourth Proportional to 711.36, 981.76 and 624.32

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Solution

The fourth proportional to 711.36, 981.76 and 624.32 is: 861.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.36 : 981.76 = 624.32 : x
  2. Step 2: Convert to fraction form
    711.36/981.76 = 624.32/x
  3. Step 3: Cross multiply
    711.36x = 981.76 × 624.32
  4. Step 4: Simplify right side
    711.36x = 612,932.40
  5. Step 5: Solve for x
    x = 612,932.40/711.36
  6. Step 6: Final answer
    x = 861.63

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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.