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Finding the Fourth Proportional to 1,111.87, 1,534.99 and 669.88

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Solution

The fourth proportional to 1,111.87, 1,534.99 and 669.88 is: 924.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.87 : 1,534.99 = 669.88 : x
  2. Step 2: Convert to fraction form
    1,111.87/1,534.99 = 669.88/x
  3. Step 3: Cross multiply
    1,111.87x = 1,534.99 × 669.88
  4. Step 4: Simplify right side
    1,111.87x = 1,028,259.10
  5. Step 5: Solve for x
    x = 1,028,259.10/1,111.87
  6. Step 6: Final answer
    x = 924.80

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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.