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Finding the Fourth Proportional to 1,411.90, 2,118.20 and 438.02

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Solution

The fourth proportional to 1,411.90, 2,118.20 and 438.02 is: 657.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,411.90 : 2,118.20 = 438.02 : x
  2. Step 2: Convert to fraction form
    1,411.90/2,118.20 = 438.02/x
  3. Step 3: Cross multiply
    1,411.90x = 2,118.20 × 438.02
  4. Step 4: Simplify right side
    1,411.90x = 927,813.96
  5. Step 5: Solve for x
    x = 927,813.96/1,411.90
  6. Step 6: Final answer
    x = 657.14

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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.