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Finding the Fourth Proportional to 1,111.28, 1,533.66 and 645.50

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Solution

The fourth proportional to 1,111.28, 1,533.66 and 645.50 is: 890.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.28 : 1,533.66 = 645.50 : x
  2. Step 2: Convert to fraction form
    1,111.28/1,533.66 = 645.50/x
  3. Step 3: Cross multiply
    1,111.28x = 1,533.66 × 645.50
  4. Step 4: Simplify right side
    1,111.28x = 989,977.53
  5. Step 5: Solve for x
    x = 989,977.53/1,111.28
  6. Step 6: Final answer
    x = 890.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.