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Finding the Fourth Proportional to 1,390.36, 2,085.54 and 1,324

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Solution

The fourth proportional to 1,390.36, 2,085.54 and 1,324 is: 1,986.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.36 : 2,085.54 = 1,324 : x
  2. Step 2: Convert to fraction form
    1,390.36/2,085.54 = 1,324/x
  3. Step 3: Cross multiply
    1,390.36x = 2,085.54 × 1,324
  4. Step 4: Simplify right side
    1,390.36x = 2,761,254.96
  5. Step 5: Solve for x
    x = 2,761,254.96/1,390.36
  6. Step 6: Final answer
    x = 1,986.00

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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.