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Finding the Fourth Proportional to 712.00, 981.03 and 478.72

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Solution

The fourth proportional to 712.00, 981.03 and 478.72 is: 659.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.00 : 981.03 = 478.72 : x
  2. Step 2: Convert to fraction form
    712.00/981.03 = 478.72/x
  3. Step 3: Cross multiply
    712.00x = 981.03 × 478.72
  4. Step 4: Simplify right side
    712.00x = 469,636.23
  5. Step 5: Solve for x
    x = 469,636.23/712.00
  6. Step 6: Final answer
    x = 659.60

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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.