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Finding the Fourth Proportional to 1,285.70, 1,774.65 and 788.66

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Solution

The fourth proportional to 1,285.70, 1,774.65 and 788.66 is: 1,088.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.70 : 1,774.65 = 788.66 : x
  2. Step 2: Convert to fraction form
    1,285.70/1,774.65 = 788.66/x
  3. Step 3: Cross multiply
    1,285.70x = 1,774.65 × 788.66
  4. Step 4: Simplify right side
    1,285.70x = 1,399,595.47
  5. Step 5: Solve for x
    x = 1,399,595.47/1,285.70
  6. Step 6: Final answer
    x = 1,088.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.