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Finding the Fourth Proportional to 631.44, 947.72 and 339.18

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Solution

The fourth proportional to 631.44, 947.72 and 339.18 is: 509.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.44 : 947.72 = 339.18 : x
  2. Step 2: Convert to fraction form
    631.44/947.72 = 339.18/x
  3. Step 3: Cross multiply
    631.44x = 947.72 × 339.18
  4. Step 4: Simplify right side
    631.44x = 321,447.67
  5. Step 5: Solve for x
    x = 321,447.67/631.44
  6. Step 6: Final answer
    x = 509.07

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1.5x scale

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.