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Finding the Fourth Proportional to 947.74, 1,420.16 and 638.45

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Solution

The fourth proportional to 947.74, 1,420.16 and 638.45 is: 956.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.74 : 1,420.16 = 638.45 : x
  2. Step 2: Convert to fraction form
    947.74/1,420.16 = 638.45/x
  3. Step 3: Cross multiply
    947.74x = 1,420.16 × 638.45
  4. Step 4: Simplify right side
    947.74x = 906,701.15
  5. Step 5: Solve for x
    x = 906,701.15/947.74
  6. Step 6: Final answer
    x = 956.70

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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.