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Finding the Fourth Proportional to 1,392.45, 2,088.94 and 612.45

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Solution

The fourth proportional to 1,392.45, 2,088.94 and 612.45 is: 918.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.45 : 2,088.94 = 612.45 : x
  2. Step 2: Convert to fraction form
    1,392.45/2,088.94 = 612.45/x
  3. Step 3: Cross multiply
    1,392.45x = 2,088.94 × 612.45
  4. Step 4: Simplify right side
    1,392.45x = 1,279,363.31
  5. Step 5: Solve for x
    x = 1,279,363.31/1,392.45
  6. Step 6: Final answer
    x = 918.79

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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.