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Finding the Fourth Proportional to 1,140.57, 1,573.88 and 643.13

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Solution

The fourth proportional to 1,140.57, 1,573.88 and 643.13 is: 887.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.57 : 1,573.88 = 643.13 : x
  2. Step 2: Convert to fraction form
    1,140.57/1,573.88 = 643.13/x
  3. Step 3: Cross multiply
    1,140.57x = 1,573.88 × 643.13
  4. Step 4: Simplify right side
    1,140.57x = 1,012,198.36
  5. Step 5: Solve for x
    x = 1,012,198.36/1,140.57
  6. Step 6: Final answer
    x = 887.45

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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.