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Finding the Fourth Proportional to 1,615.12, 2,421.06 and 640.24

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Solution

The fourth proportional to 1,615.12, 2,421.06 and 640.24 is: 959.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.12 : 2,421.06 = 640.24 : x
  2. Step 2: Convert to fraction form
    1,615.12/2,421.06 = 640.24/x
  3. Step 3: Cross multiply
    1,615.12x = 2,421.06 × 640.24
  4. Step 4: Simplify right side
    1,615.12x = 1,550,059.45
  5. Step 5: Solve for x
    x = 1,550,059.45/1,615.12
  6. Step 6: Final answer
    x = 959.72

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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.