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Finding the Fourth Proportional to 770.02, 1,154.90 and 379.91

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Solution

The fourth proportional to 770.02, 1,154.90 and 379.91 is: 569.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.02 : 1,154.90 = 379.91 : x
  2. Step 2: Convert to fraction form
    770.02/1,154.90 = 379.91/x
  3. Step 3: Cross multiply
    770.02x = 1,154.90 × 379.91
  4. Step 4: Simplify right side
    770.02x = 438,761.90
  5. Step 5: Solve for x
    x = 438,761.90/770.02
  6. Step 6: Final answer
    x = 569.81

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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.