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Finding the Fourth Proportional to 1,212.58, 1,818.56 and 390.95

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Solution

The fourth proportional to 1,212.58, 1,818.56 and 390.95 is: 586.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.58 : 1,818.56 = 390.95 : x
  2. Step 2: Convert to fraction form
    1,212.58/1,818.56 = 390.95/x
  3. Step 3: Cross multiply
    1,212.58x = 1,818.56 × 390.95
  4. Step 4: Simplify right side
    1,212.58x = 710,964.08
  5. Step 5: Solve for x
    x = 710,964.08/1,212.58
  6. Step 6: Final answer
    x = 586.32

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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.