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Finding the Fourth Proportional to 1,140.46, 1,573.81 and 643.10

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Solution

The fourth proportional to 1,140.46, 1,573.81 and 643.10 is: 887.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.46 : 1,573.81 = 643.10 : x
  2. Step 2: Convert to fraction form
    1,140.46/1,573.81 = 643.10/x
  3. Step 3: Cross multiply
    1,140.46x = 1,573.81 × 643.10
  4. Step 4: Simplify right side
    1,140.46x = 1,012,107.73
  5. Step 5: Solve for x
    x = 1,012,107.73/1,140.46
  6. Step 6: Final answer
    x = 887.46

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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.