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Finding the Fourth Proportional to 1,420.87, 2,128.53 and 802.70

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Solution

The fourth proportional to 1,420.87, 2,128.53 and 802.70 is: 1,202.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.87 : 2,128.53 = 802.70 : x
  2. Step 2: Convert to fraction form
    1,420.87/2,128.53 = 802.70/x
  3. Step 3: Cross multiply
    1,420.87x = 2,128.53 × 802.70
  4. Step 4: Simplify right side
    1,420.87x = 1,708,571.03
  5. Step 5: Solve for x
    x = 1,708,571.03/1,420.87
  6. Step 6: Final answer
    x = 1,202.48

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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.