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Finding the Fourth Proportional to 1,121.70, 1,548.06 and 624.42

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Solution

The fourth proportional to 1,121.70, 1,548.06 and 624.42 is: 861.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.70 : 1,548.06 = 624.42 : x
  2. Step 2: Convert to fraction form
    1,121.70/1,548.06 = 624.42/x
  3. Step 3: Cross multiply
    1,121.70x = 1,548.06 × 624.42
  4. Step 4: Simplify right side
    1,121.70x = 966,639.63
  5. Step 5: Solve for x
    x = 966,639.63/1,121.70
  6. Step 6: Final answer
    x = 861.76

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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.