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Finding the Fourth Proportional to 1,245.03, 1,868.42 and 921.16

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Solution

The fourth proportional to 1,245.03, 1,868.42 and 921.16 is: 1,382.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.03 : 1,868.42 = 921.16 : x
  2. Step 2: Convert to fraction form
    1,245.03/1,868.42 = 921.16/x
  3. Step 3: Cross multiply
    1,245.03x = 1,868.42 × 921.16
  4. Step 4: Simplify right side
    1,245.03x = 1,721,113.77
  5. Step 5: Solve for x
    x = 1,721,113.77/1,245.03
  6. Step 6: Final answer
    x = 1,382.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.