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Finding the Fourth Proportional to 1,620.39, 2,430.49 and 840.03

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Solution

The fourth proportional to 1,620.39, 2,430.49 and 840.03 is: 1,260.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.39 : 2,430.49 = 840.03 : x
  2. Step 2: Convert to fraction form
    1,620.39/2,430.49 = 840.03/x
  3. Step 3: Cross multiply
    1,620.39x = 2,430.49 × 840.03
  4. Step 4: Simplify right side
    1,620.39x = 2,041,684.51
  5. Step 5: Solve for x
    x = 2,041,684.51/1,620.39
  6. Step 6: Final answer
    x = 1,260.00

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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.