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Finding the Fourth Proportional to 1,296.64, 1,943.70 and 645.40

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Solution

The fourth proportional to 1,296.64, 1,943.70 and 645.40 is: 967.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.64 : 1,943.70 = 645.40 : x
  2. Step 2: Convert to fraction form
    1,296.64/1,943.70 = 645.40/x
  3. Step 3: Cross multiply
    1,296.64x = 1,943.70 × 645.40
  4. Step 4: Simplify right side
    1,296.64x = 1,254,463.98
  5. Step 5: Solve for x
    x = 1,254,463.98/1,296.64
  6. Step 6: Final answer
    x = 967.47

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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.