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Finding the Fourth Proportional to 1,345.26, 1,856.55 and 755.85

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Solution

The fourth proportional to 1,345.26, 1,856.55 and 755.85 is: 1,043.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.26 : 1,856.55 = 755.85 : x
  2. Step 2: Convert to fraction form
    1,345.26/1,856.55 = 755.85/x
  3. Step 3: Cross multiply
    1,345.26x = 1,856.55 × 755.85
  4. Step 4: Simplify right side
    1,345.26x = 1,403,273.32
  5. Step 5: Solve for x
    x = 1,403,273.32/1,345.26
  6. Step 6: Final answer
    x = 1,043.12

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1.5x scale

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.