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Finding the Fourth Proportional to 1,114.56, 1,668.60 and 929.88

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Solution

The fourth proportional to 1,114.56, 1,668.60 and 929.88 is: 1,392.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,114.56 : 1,668.60 = 929.88 : x
  2. Step 2: Convert to fraction form
    1,114.56/1,668.60 = 929.88/x
  3. Step 3: Cross multiply
    1,114.56x = 1,668.60 × 929.88
  4. Step 4: Simplify right side
    1,114.56x = 1,551,597.77
  5. Step 5: Solve for x
    x = 1,551,597.77/1,114.56
  6. Step 6: Final answer
    x = 1,392.12

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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.