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Finding the Fourth Proportional to 947.37, 1,420.62 and 399.25

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Solution

The fourth proportional to 947.37, 1,420.62 and 399.25 is: 598.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.37 : 1,420.62 = 399.25 : x
  2. Step 2: Convert to fraction form
    947.37/1,420.62 = 399.25/x
  3. Step 3: Cross multiply
    947.37x = 1,420.62 × 399.25
  4. Step 4: Simplify right side
    947.37x = 567,185.06
  5. Step 5: Solve for x
    x = 567,185.06/947.37
  6. Step 6: Final answer
    x = 598.70

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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.