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Finding the Fourth Proportional to 1,400.60, 2,100.90 and 578.60

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Solution

The fourth proportional to 1,400.60, 2,100.90 and 578.60 is: 867.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,400.60 : 2,100.90 = 578.60 : x
  2. Step 2: Convert to fraction form
    1,400.60/2,100.90 = 578.60/x
  3. Step 3: Cross multiply
    1,400.60x = 2,100.90 × 578.60
  4. Step 4: Simplify right side
    1,400.60x = 1,215,580.74
  5. Step 5: Solve for x
    x = 1,215,580.74/1,400.60
  6. Step 6: Final answer
    x = 867.90

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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.