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Finding the Fourth Proportional to 770.32, 1,155.12 and 307.90

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Solution

The fourth proportional to 770.32, 1,155.12 and 307.90 is: 461.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.32 : 1,155.12 = 307.90 : x
  2. Step 2: Convert to fraction form
    770.32/1,155.12 = 307.90/x
  3. Step 3: Cross multiply
    770.32x = 1,155.12 × 307.90
  4. Step 4: Simplify right side
    770.32x = 355,661.45
  5. Step 5: Solve for x
    x = 355,661.45/770.32
  6. Step 6: Final answer
    x = 461.71

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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.