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Finding the Fourth Proportional to 1,970.64, 2,721.60 and 1,720.80

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Solution

The fourth proportional to 1,970.64, 2,721.60 and 1,720.80 is: 2,376.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,970.64 : 2,721.60 = 1,720.80 : x
  2. Step 2: Convert to fraction form
    1,970.64/2,721.60 = 1,720.80/x
  3. Step 3: Cross multiply
    1,970.64x = 2,721.60 × 1,720.80
  4. Step 4: Simplify right side
    1,970.64x = 4,683,329.28
  5. Step 5: Solve for x
    x = 4,683,329.28/1,970.64
  6. Step 6: Final answer
    x = 2,376.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.