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Finding the Fourth Proportional to 1,392.64, 2,089.10 and 515.37

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Solution

The fourth proportional to 1,392.64, 2,089.10 and 515.37 is: 773.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.64 : 2,089.10 = 515.37 : x
  2. Step 2: Convert to fraction form
    1,392.64/2,089.10 = 515.37/x
  3. Step 3: Cross multiply
    1,392.64x = 2,089.10 × 515.37
  4. Step 4: Simplify right side
    1,392.64x = 1,076,666.66
  5. Step 5: Solve for x
    x = 1,076,666.66/1,392.64
  6. Step 6: Final answer
    x = 773.11

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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.