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Finding the Fourth Proportional to 1,430.84, 1,969.90 and 1,223.48

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Solution

The fourth proportional to 1,430.84, 1,969.90 and 1,223.48 is: 1,684.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,430.84 : 1,969.90 = 1,223.48 : x
  2. Step 2: Convert to fraction form
    1,430.84/1,969.90 = 1,223.48/x
  3. Step 3: Cross multiply
    1,430.84x = 1,969.90 × 1,223.48
  4. Step 4: Simplify right side
    1,430.84x = 2,410,133.25
  5. Step 5: Solve for x
    x = 2,410,133.25/1,430.84
  6. Step 6: Final answer
    x = 1,684.42

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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.