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Finding the Fourth Proportional to 947.15, 1,420.35 and 639.14

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Solution

The fourth proportional to 947.15, 1,420.35 and 639.14 is: 958.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.15 : 1,420.35 = 639.14 : x
  2. Step 2: Convert to fraction form
    947.15/1,420.35 = 639.14/x
  3. Step 3: Cross multiply
    947.15x = 1,420.35 × 639.14
  4. Step 4: Simplify right side
    947.15x = 907,802.50
  5. Step 5: Solve for x
    x = 907,802.50/947.15
  6. Step 6: Final answer
    x = 958.46

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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.