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Finding the Fourth Proportional to 789.14, 1,088.72 and 493.90

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Solution

The fourth proportional to 789.14, 1,088.72 and 493.90 is: 681.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.14 : 1,088.72 = 493.90 : x
  2. Step 2: Convert to fraction form
    789.14/1,088.72 = 493.90/x
  3. Step 3: Cross multiply
    789.14x = 1,088.72 × 493.90
  4. Step 4: Simplify right side
    789.14x = 537,714.08
  5. Step 5: Solve for x
    x = 537,714.08/789.14
  6. Step 6: Final answer
    x = 681.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.