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Finding the Fourth Proportional to 1,860.30, 2,790.45 and 561.74

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Solution

The fourth proportional to 1,860.30, 2,790.45 and 561.74 is: 842.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,860.30 : 2,790.45 = 561.74 : x
  2. Step 2: Convert to fraction form
    1,860.30/2,790.45 = 561.74/x
  3. Step 3: Cross multiply
    1,860.30x = 2,790.45 × 561.74
  4. Step 4: Simplify right side
    1,860.30x = 1,567,493.43
  5. Step 5: Solve for x
    x = 1,567,493.43/1,860.30
  6. Step 6: Final answer
    x = 842.60

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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.