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Finding the Fourth Proportional to 1,409.08, 2,113.90 and 543.40

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Solution

The fourth proportional to 1,409.08, 2,113.90 and 543.40 is: 815.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,409.08 : 2,113.90 = 543.40 : x
  2. Step 2: Convert to fraction form
    1,409.08/2,113.90 = 543.40/x
  3. Step 3: Cross multiply
    1,409.08x = 2,113.90 × 543.40
  4. Step 4: Simplify right side
    1,409.08x = 1,148,693.26
  5. Step 5: Solve for x
    x = 1,148,693.26/1,409.08
  6. Step 6: Final answer
    x = 815.21

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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.