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Finding the Fourth Proportional to 1,113.90, 1,669.03 and 383.08

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Solution

The fourth proportional to 1,113.90, 1,669.03 and 383.08 is: 573.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.90 : 1,669.03 = 383.08 : x
  2. Step 2: Convert to fraction form
    1,113.90/1,669.03 = 383.08/x
  3. Step 3: Cross multiply
    1,113.90x = 1,669.03 × 383.08
  4. Step 4: Simplify right side
    1,113.90x = 639,372.01
  5. Step 5: Solve for x
    x = 639,372.01/1,113.90
  6. Step 6: Final answer
    x = 573.99

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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.