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Finding the Fourth Proportional to 2,370.51, 3,555.63 and 639

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Solution

The fourth proportional to 2,370.51, 3,555.63 and 639 is: 958.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,370.51 : 3,555.63 = 639 : x
  2. Step 2: Convert to fraction form
    2,370.51/3,555.63 = 639/x
  3. Step 3: Cross multiply
    2,370.51x = 3,555.63 × 639
  4. Step 4: Simplify right side
    2,370.51x = 2,272,047.57
  5. Step 5: Solve for x
    x = 2,272,047.57/2,370.51
  6. Step 6: Final answer
    x = 958.46

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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.