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Finding the Fourth Proportional to 1,459.46, 2,189.55 and 485.57

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Solution

The fourth proportional to 1,459.46, 2,189.55 and 485.57 is: 728.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,459.46 : 2,189.55 = 485.57 : x
  2. Step 2: Convert to fraction form
    1,459.46/2,189.55 = 485.57/x
  3. Step 3: Cross multiply
    1,459.46x = 2,189.55 × 485.57
  4. Step 4: Simplify right side
    1,459.46x = 1,063,179.79
  5. Step 5: Solve for x
    x = 1,063,179.79/1,459.46
  6. Step 6: Final answer
    x = 728.47

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1.5x scale

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.