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Finding the Fourth Proportional to 770.28, 1,155.77 and 404.99

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Solution

The fourth proportional to 770.28, 1,155.77 and 404.99 is: 607.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.28 : 1,155.77 = 404.99 : x
  2. Step 2: Convert to fraction form
    770.28/1,155.77 = 404.99/x
  3. Step 3: Cross multiply
    770.28x = 1,155.77 × 404.99
  4. Step 4: Simplify right side
    770.28x = 468,070.38
  5. Step 5: Solve for x
    x = 468,070.38/770.28
  6. Step 6: Final answer
    x = 607.66

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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.