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Finding the Fourth Proportional to 1,856.49, 2,784.28 and 816.76

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Solution

The fourth proportional to 1,856.49, 2,784.28 and 816.76 is: 1,224.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,856.49 : 2,784.28 = 816.76 : x
  2. Step 2: Convert to fraction form
    1,856.49/2,784.28 = 816.76/x
  3. Step 3: Cross multiply
    1,856.49x = 2,784.28 × 816.76
  4. Step 4: Simplify right side
    1,856.49x = 2,274,075.84
  5. Step 5: Solve for x
    x = 2,274,075.84/1,856.49
  6. Step 6: Final answer
    x = 1,224.93

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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.