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Finding the Fourth Proportional to 1,409.34, 2,114.88 and 678.99

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Solution

The fourth proportional to 1,409.34, 2,114.88 and 678.99 is: 1,018.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,409.34 : 2,114.88 = 678.99 : x
  2. Step 2: Convert to fraction form
    1,409.34/2,114.88 = 678.99/x
  3. Step 3: Cross multiply
    1,409.34x = 2,114.88 × 678.99
  4. Step 4: Simplify right side
    1,409.34x = 1,435,971.80
  5. Step 5: Solve for x
    x = 1,435,971.80/1,409.34
  6. Step 6: Final answer
    x = 1,018.90

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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.