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Finding the Fourth Proportional to 1,385.52, 2,077.80 and 770.16

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Solution

The fourth proportional to 1,385.52, 2,077.80 and 770.16 is: 1,154.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.52 : 2,077.80 = 770.16 : x
  2. Step 2: Convert to fraction form
    1,385.52/2,077.80 = 770.16/x
  3. Step 3: Cross multiply
    1,385.52x = 2,077.80 × 770.16
  4. Step 4: Simplify right side
    1,385.52x = 1,600,238.45
  5. Step 5: Solve for x
    x = 1,600,238.45/1,385.52
  6. Step 6: Final answer
    x = 1,154.97

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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.