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Finding the Fourth Proportional to 2,043.40, 3,065.40 and 947.87

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Solution

The fourth proportional to 2,043.40, 3,065.40 and 947.87 is: 1,421.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,043.40 : 3,065.40 = 947.87 : x
  2. Step 2: Convert to fraction form
    2,043.40/3,065.40 = 947.87/x
  3. Step 3: Cross multiply
    2,043.40x = 3,065.40 × 947.87
  4. Step 4: Simplify right side
    2,043.40x = 2,905,598.33
  5. Step 5: Solve for x
    x = 2,905,598.33/2,043.40
  6. Step 6: Final answer
    x = 1,421.95

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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.