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Finding the Fourth Proportional to 1,245.68, 1,870.20 and 661.20

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Solution

The fourth proportional to 1,245.68, 1,870.20 and 661.20 is: 992.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.68 : 1,870.20 = 661.20 : x
  2. Step 2: Convert to fraction form
    1,245.68/1,870.20 = 661.20/x
  3. Step 3: Cross multiply
    1,245.68x = 1,870.20 × 661.20
  4. Step 4: Simplify right side
    1,245.68x = 1,236,576.24
  5. Step 5: Solve for x
    x = 1,236,576.24/1,245.68
  6. Step 6: Final answer
    x = 992.69

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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.