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Finding the Fourth Proportional to 1,880.39, 2,821.47 and 840.30

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Solution

The fourth proportional to 1,880.39, 2,821.47 and 840.30 is: 1,260.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,880.39 : 2,821.47 = 840.30 : x
  2. Step 2: Convert to fraction form
    1,880.39/2,821.47 = 840.30/x
  3. Step 3: Cross multiply
    1,880.39x = 2,821.47 × 840.30
  4. Step 4: Simplify right side
    1,880.39x = 2,370,881.24
  5. Step 5: Solve for x
    x = 2,370,881.24/1,880.39
  6. Step 6: Final answer
    x = 1,260.85

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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.