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Finding the Fourth Proportional to 1,239.91, 1,859.54 and 654.12

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Solution

The fourth proportional to 1,239.91, 1,859.54 and 654.12 is: 981.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.91 : 1,859.54 = 654.12 : x
  2. Step 2: Convert to fraction form
    1,239.91/1,859.54 = 654.12/x
  3. Step 3: Cross multiply
    1,239.91x = 1,859.54 × 654.12
  4. Step 4: Simplify right side
    1,239.91x = 1,216,359.03
  5. Step 5: Solve for x
    x = 1,216,359.03/1,239.91
  6. Step 6: Final answer
    x = 981.01

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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.