Home / 1,281.60-1,922.65-459.86

Finding the Fourth Proportional to 1,281.60, 1,922.65 and 459.86

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Solution

The fourth proportional to 1,281.60, 1,922.65 and 459.86 is: 689.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.60 : 1,922.65 = 459.86 : x
  2. Step 2: Convert to fraction form
    1,281.60/1,922.65 = 459.86/x
  3. Step 3: Cross multiply
    1,281.60x = 1,922.65 × 459.86
  4. Step 4: Simplify right side
    1,281.60x = 884,139.07
  5. Step 5: Solve for x
    x = 884,139.07/1,281.60
  6. Step 6: Final answer
    x = 689.87

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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.