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Finding the Fourth Proportional to 1,859.74, 2,790 and 561.11

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Solution

The fourth proportional to 1,859.74, 2,790 and 561.11 is: 841.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,859.74 : 2,790 = 561.11 : x
  2. Step 2: Convert to fraction form
    1,859.74/2,790 = 561.11/x
  3. Step 3: Cross multiply
    1,859.74x = 2,790 × 561.11
  4. Step 4: Simplify right side
    1,859.74x = 1,565,482.95
  5. Step 5: Solve for x
    x = 1,565,482.95/1,859.74
  6. Step 6: Final answer
    x = 841.78

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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.