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Finding the Fourth Proportional to 1,111.68, 1,533.78 and 669.72

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Solution

The fourth proportional to 1,111.68, 1,533.78 and 669.72 is: 924.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.68 : 1,533.78 = 669.72 : x
  2. Step 2: Convert to fraction form
    1,111.68/1,533.78 = 669.72/x
  3. Step 3: Cross multiply
    1,111.68x = 1,533.78 × 669.72
  4. Step 4: Simplify right side
    1,111.68x = 1,027,203.14
  5. Step 5: Solve for x
    x = 1,027,203.14/1,111.68
  6. Step 6: Final answer
    x = 924.01

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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.