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Finding the Fourth Proportional to 631.80, 947.70 and 626.40

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Solution

The fourth proportional to 631.80, 947.70 and 626.40 is: 939.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.80 : 947.70 = 626.40 : x
  2. Step 2: Convert to fraction form
    631.80/947.70 = 626.40/x
  3. Step 3: Cross multiply
    631.80x = 947.70 × 626.40
  4. Step 4: Simplify right side
    631.80x = 593,639.28
  5. Step 5: Solve for x
    x = 593,639.28/631.80
  6. Step 6: Final answer
    x = 939.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.