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Finding the Fourth Proportional to 1,113.08, 1,668.81 and 643.89

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Solution

The fourth proportional to 1,113.08, 1,668.81 and 643.89 is: 965.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.08 : 1,668.81 = 643.89 : x
  2. Step 2: Convert to fraction form
    1,113.08/1,668.81 = 643.89/x
  3. Step 3: Cross multiply
    1,113.08x = 1,668.81 × 643.89
  4. Step 4: Simplify right side
    1,113.08x = 1,074,533.91
  5. Step 5: Solve for x
    x = 1,074,533.91/1,113.08
  6. Step 6: Final answer
    x = 965.37

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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.