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Finding the Fourth Proportional to 1,325.86, 1,988.80 and 459.56

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Solution

The fourth proportional to 1,325.86, 1,988.80 and 459.56 is: 689.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.86 : 1,988.80 = 459.56 : x
  2. Step 2: Convert to fraction form
    1,325.86/1,988.80 = 459.56/x
  3. Step 3: Cross multiply
    1,325.86x = 1,988.80 × 459.56
  4. Step 4: Simplify right side
    1,325.86x = 913,976.75
  5. Step 5: Solve for x
    x = 913,976.75/1,325.86
  6. Step 6: Final answer
    x = 689.35

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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.