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Finding the Fourth Proportional to 929.64, 1,291.80 and 919.53

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Solution

The fourth proportional to 929.64, 1,291.80 and 919.53 is: 1,277.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.64 : 1,291.80 = 919.53 : x
  2. Step 2: Convert to fraction form
    929.64/1,291.80 = 919.53/x
  3. Step 3: Cross multiply
    929.64x = 1,291.80 × 919.53
  4. Step 4: Simplify right side
    929.64x = 1,187,848.85
  5. Step 5: Solve for x
    x = 1,187,848.85/929.64
  6. Step 6: Final answer
    x = 1,277.75

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.