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Finding the Fourth Proportional to 1,143.09, 1,577.46 and 645.71

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Solution

The fourth proportional to 1,143.09, 1,577.46 and 645.71 is: 891.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.09 : 1,577.46 = 645.71 : x
  2. Step 2: Convert to fraction form
    1,143.09/1,577.46 = 645.71/x
  3. Step 3: Cross multiply
    1,143.09x = 1,577.46 × 645.71
  4. Step 4: Simplify right side
    1,143.09x = 1,018,573.81
  5. Step 5: Solve for x
    x = 1,018,573.81/1,143.09
  6. Step 6: Final answer
    x = 891.07

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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.