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Finding the Fourth Proportional to 1,122.60, 1,548.74 and 680.34

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Solution

The fourth proportional to 1,122.60, 1,548.74 and 680.34 is: 938.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.60 : 1,548.74 = 680.34 : x
  2. Step 2: Convert to fraction form
    1,122.60/1,548.74 = 680.34/x
  3. Step 3: Cross multiply
    1,122.60x = 1,548.74 × 680.34
  4. Step 4: Simplify right side
    1,122.60x = 1,053,666.37
  5. Step 5: Solve for x
    x = 1,053,666.37/1,122.60
  6. Step 6: Final answer
    x = 938.59

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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.