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Finding the Fourth Proportional to 826.63, 1,240.43 and 313.99

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Solution

The fourth proportional to 826.63, 1,240.43 and 313.99 is: 471.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.63 : 1,240.43 = 313.99 : x
  2. Step 2: Convert to fraction form
    826.63/1,240.43 = 313.99/x
  3. Step 3: Cross multiply
    826.63x = 1,240.43 × 313.99
  4. Step 4: Simplify right side
    826.63x = 389,482.62
  5. Step 5: Solve for x
    x = 389,482.62/826.63
  6. Step 6: Final answer
    x = 471.17

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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.