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Finding the Fourth Proportional to 1,285.70, 1,927.59 and 920.26

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Solution

The fourth proportional to 1,285.70, 1,927.59 and 920.26 is: 1,379.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.70 : 1,927.59 = 920.26 : x
  2. Step 2: Convert to fraction form
    1,285.70/1,927.59 = 920.26/x
  3. Step 3: Cross multiply
    1,285.70x = 1,927.59 × 920.26
  4. Step 4: Simplify right side
    1,285.70x = 1,773,883.97
  5. Step 5: Solve for x
    x = 1,773,883.97/1,285.70
  6. Step 6: Final answer
    x = 1,379.70

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1.5x scale

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.