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Finding the Fourth Proportional to 631.80, 939.60 and 583.20

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Solution

The fourth proportional to 631.80, 939.60 and 583.20 is: 867.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.80 : 939.60 = 583.20 : x
  2. Step 2: Convert to fraction form
    631.80/939.60 = 583.20/x
  3. Step 3: Cross multiply
    631.80x = 939.60 × 583.20
  4. Step 4: Simplify right side
    631.80x = 547,974.72
  5. Step 5: Solve for x
    x = 547,974.72/631.80
  6. Step 6: Final answer
    x = 867.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.