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Finding the Fourth Proportional to 947.70, 1,419.73 and 783.17

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Solution

The fourth proportional to 947.70, 1,419.73 and 783.17 is: 1,173.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.70 : 1,419.73 = 783.17 : x
  2. Step 2: Convert to fraction form
    947.70/1,419.73 = 783.17/x
  3. Step 3: Cross multiply
    947.70x = 1,419.73 × 783.17
  4. Step 4: Simplify right side
    947.70x = 1,111,886.21
  5. Step 5: Solve for x
    x = 1,111,886.21/947.70
  6. Step 6: Final answer
    x = 1,173.25

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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.