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Finding the Fourth Proportional to 1,389.74, 2,084.61 and 568.40

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Solution

The fourth proportional to 1,389.74, 2,084.61 and 568.40 is: 852.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.74 : 2,084.61 = 568.40 : x
  2. Step 2: Convert to fraction form
    1,389.74/2,084.61 = 568.40/x
  3. Step 3: Cross multiply
    1,389.74x = 2,084.61 × 568.40
  4. Step 4: Simplify right side
    1,389.74x = 1,184,892.32
  5. Step 5: Solve for x
    x = 1,184,892.32/1,389.74
  6. Step 6: Final answer
    x = 852.60

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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.