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Finding the Fourth Proportional to 1,385.58, 2,078.48 and 691.53

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Solution

The fourth proportional to 1,385.58, 2,078.48 and 691.53 is: 1,037.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.58 : 2,078.48 = 691.53 : x
  2. Step 2: Convert to fraction form
    1,385.58/2,078.48 = 691.53/x
  3. Step 3: Cross multiply
    1,385.58x = 2,078.48 × 691.53
  4. Step 4: Simplify right side
    1,385.58x = 1,437,327.82
  5. Step 5: Solve for x
    x = 1,437,327.82/1,385.58
  6. Step 6: Final answer
    x = 1,037.35

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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.