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Finding the Fourth Proportional to 770.36, 1,155.93 and 380.35

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Solution

The fourth proportional to 770.36, 1,155.93 and 380.35 is: 570.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.36 : 1,155.93 = 380.35 : x
  2. Step 2: Convert to fraction form
    770.36/1,155.93 = 380.35/x
  3. Step 3: Cross multiply
    770.36x = 1,155.93 × 380.35
  4. Step 4: Simplify right side
    770.36x = 439,657.98
  5. Step 5: Solve for x
    x = 439,657.98/770.36
  6. Step 6: Final answer
    x = 570.72

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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.