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Finding the Fourth Proportional to 2,100.20, 3,150.30 and 561.20

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Solution

The fourth proportional to 2,100.20, 3,150.30 and 561.20 is: 841.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,100.20 : 3,150.30 = 561.20 : x
  2. Step 2: Convert to fraction form
    2,100.20/3,150.30 = 561.20/x
  3. Step 3: Cross multiply
    2,100.20x = 3,150.30 × 561.20
  4. Step 4: Simplify right side
    2,100.20x = 1,767,948.36
  5. Step 5: Solve for x
    x = 1,767,948.36/2,100.20
  6. Step 6: Final answer
    x = 841.80

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1.5x scale

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.