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Finding the Fourth Proportional to 770.18, 1,155.47 and 423.81

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Solution

The fourth proportional to 770.18, 1,155.47 and 423.81 is: 635.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.18 : 1,155.47 = 423.81 : x
  2. Step 2: Convert to fraction form
    770.18/1,155.47 = 423.81/x
  3. Step 3: Cross multiply
    770.18x = 1,155.47 × 423.81
  4. Step 4: Simplify right side
    770.18x = 489,697.62
  5. Step 5: Solve for x
    x = 489,697.62/770.18
  6. Step 6: Final answer
    x = 635.83

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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.