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Finding the Fourth Proportional to 923.98, 1,385.79 and 770.86

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Solution

The fourth proportional to 923.98, 1,385.79 and 770.86 is: 1,156.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.98 : 1,385.79 = 770.86 : x
  2. Step 2: Convert to fraction form
    923.98/1,385.79 = 770.86/x
  3. Step 3: Cross multiply
    923.98x = 1,385.79 × 770.86
  4. Step 4: Simplify right side
    923.98x = 1,068,250.08
  5. Step 5: Solve for x
    x = 1,068,250.08/923.98
  6. Step 6: Final answer
    x = 1,156.14

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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.