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Finding the Fourth Proportional to 1,210.08, 1,815 and 388.92

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Solution

The fourth proportional to 1,210.08, 1,815 and 388.92 is: 583.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.08 : 1,815 = 388.92 : x
  2. Step 2: Convert to fraction form
    1,210.08/1,815 = 388.92/x
  3. Step 3: Cross multiply
    1,210.08x = 1,815 × 388.92
  4. Step 4: Simplify right side
    1,210.08x = 705,889.80
  5. Step 5: Solve for x
    x = 705,889.80/1,210.08
  6. Step 6: Final answer
    x = 583.34

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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.