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Finding the Fourth Proportional to 1,120.45, 1,680.40 and 471.01

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Solution

The fourth proportional to 1,120.45, 1,680.40 and 471.01 is: 706.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.45 : 1,680.40 = 471.01 : x
  2. Step 2: Convert to fraction form
    1,120.45/1,680.40 = 471.01/x
  3. Step 3: Cross multiply
    1,120.45x = 1,680.40 × 471.01
  4. Step 4: Simplify right side
    1,120.45x = 791,485.20
  5. Step 5: Solve for x
    x = 791,485.20/1,120.45
  6. Step 6: Final answer
    x = 706.40

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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.