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Finding the Fourth Proportional to 1,513.63, 2,270.70 and 691.98

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Solution

The fourth proportional to 1,513.63, 2,270.70 and 691.98 is: 1,038.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,513.63 : 2,270.70 = 691.98 : x
  2. Step 2: Convert to fraction form
    1,513.63/2,270.70 = 691.98/x
  3. Step 3: Cross multiply
    1,513.63x = 2,270.70 × 691.98
  4. Step 4: Simplify right side
    1,513.63x = 1,571,278.99
  5. Step 5: Solve for x
    x = 1,571,278.99/1,513.63
  6. Step 6: Final answer
    x = 1,038.09

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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.