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Finding the Fourth Proportional to 1,947.42, 2,921.40 and 714.51

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Solution

The fourth proportional to 1,947.42, 2,921.40 and 714.51 is: 1,071.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,947.42 : 2,921.40 = 714.51 : x
  2. Step 2: Convert to fraction form
    1,947.42/2,921.40 = 714.51/x
  3. Step 3: Cross multiply
    1,947.42x = 2,921.40 × 714.51
  4. Step 4: Simplify right side
    1,947.42x = 2,087,369.51
  5. Step 5: Solve for x
    x = 2,087,369.51/1,947.42
  6. Step 6: Final answer
    x = 1,071.86

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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.