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Finding the Fourth Proportional to 1,312.26, 1,964.79 and 921.06

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Solution

The fourth proportional to 1,312.26, 1,964.79 and 921.06 is: 1,379.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.26 : 1,964.79 = 921.06 : x
  2. Step 2: Convert to fraction form
    1,312.26/1,964.79 = 921.06/x
  3. Step 3: Cross multiply
    1,312.26x = 1,964.79 × 921.06
  4. Step 4: Simplify right side
    1,312.26x = 1,809,689.48
  5. Step 5: Solve for x
    x = 1,809,689.48/1,312.26
  6. Step 6: Final answer
    x = 1,379.06

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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.