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Finding the Fourth Proportional to 1,418.13, 2,128.16 and 493.68

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Solution

The fourth proportional to 1,418.13, 2,128.16 and 493.68 is: 740.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.13 : 2,128.16 = 493.68 : x
  2. Step 2: Convert to fraction form
    1,418.13/2,128.16 = 493.68/x
  3. Step 3: Cross multiply
    1,418.13x = 2,128.16 × 493.68
  4. Step 4: Simplify right side
    1,418.13x = 1,050,631.26
  5. Step 5: Solve for x
    x = 1,050,631.26/1,418.13
  6. Step 6: Final answer
    x = 740.86

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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.