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Finding the Fourth Proportional to 1,129.95, 1,693.71 and 480.33

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Solution

The fourth proportional to 1,129.95, 1,693.71 and 480.33 is: 719.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.95 : 1,693.71 = 480.33 : x
  2. Step 2: Convert to fraction form
    1,129.95/1,693.71 = 480.33/x
  3. Step 3: Cross multiply
    1,129.95x = 1,693.71 × 480.33
  4. Step 4: Simplify right side
    1,129.95x = 813,539.72
  5. Step 5: Solve for x
    x = 813,539.72/1,129.95
  6. Step 6: Final answer
    x = 719.98

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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.