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Finding the Fourth Proportional to 1,113.89, 1,670.64 and 383.48

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Solution

The fourth proportional to 1,113.89, 1,670.64 and 383.48 is: 575.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.89 : 1,670.64 = 383.48 : x
  2. Step 2: Convert to fraction form
    1,113.89/1,670.64 = 383.48/x
  3. Step 3: Cross multiply
    1,113.89x = 1,670.64 × 383.48
  4. Step 4: Simplify right side
    1,113.89x = 640,657.03
  5. Step 5: Solve for x
    x = 640,657.03/1,113.89
  6. Step 6: Final answer
    x = 575.15

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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.