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Finding the Fourth Proportional to 770.94, 1,155.66 and 614.39

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Solution

The fourth proportional to 770.94, 1,155.66 and 614.39 is: 920.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.94 : 1,155.66 = 614.39 : x
  2. Step 2: Convert to fraction form
    770.94/1,155.66 = 614.39/x
  3. Step 3: Cross multiply
    770.94x = 1,155.66 × 614.39
  4. Step 4: Simplify right side
    770.94x = 710,025.95
  5. Step 5: Solve for x
    x = 710,025.95/770.94
  6. Step 6: Final answer
    x = 920.99

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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.