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Finding the Fourth Proportional to 1,345.21, 1,856.28 and 755.66

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Solution

The fourth proportional to 1,345.21, 1,856.28 and 755.66 is: 1,042.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.21 : 1,856.28 = 755.66 : x
  2. Step 2: Convert to fraction form
    1,345.21/1,856.28 = 755.66/x
  3. Step 3: Cross multiply
    1,345.21x = 1,856.28 × 755.66
  4. Step 4: Simplify right side
    1,345.21x = 1,402,724.02
  5. Step 5: Solve for x
    x = 1,402,724.02/1,345.21
  6. Step 6: Final answer
    x = 1,042.76

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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.