Home / 1,143.07-1,577.41-645.70

Finding the Fourth Proportional to 1,143.07, 1,577.41 and 645.70

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Solution

The fourth proportional to 1,143.07, 1,577.41 and 645.70 is: 891.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.07 : 1,577.41 = 645.70 : x
  2. Step 2: Convert to fraction form
    1,143.07/1,577.41 = 645.70/x
  3. Step 3: Cross multiply
    1,143.07x = 1,577.41 × 645.70
  4. Step 4: Simplify right side
    1,143.07x = 1,018,533.64
  5. Step 5: Solve for x
    x = 1,018,533.64/1,143.07
  6. Step 6: Final answer
    x = 891.05

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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.