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Finding the Fourth Proportional to 1,345.09, 1,856.12 and 755.51

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Solution

The fourth proportional to 1,345.09, 1,856.12 and 755.51 is: 1,042.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.09 : 1,856.12 = 755.51 : x
  2. Step 2: Convert to fraction form
    1,345.09/1,856.12 = 755.51/x
  3. Step 3: Cross multiply
    1,345.09x = 1,856.12 × 755.51
  4. Step 4: Simplify right side
    1,345.09x = 1,402,318.08
  5. Step 5: Solve for x
    x = 1,402,318.08/1,345.09
  6. Step 6: Final answer
    x = 1,042.55

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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.