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Finding the Fourth Proportional to 2,615.58, 3,920.90 and 971.01

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Solution

The fourth proportional to 2,615.58, 3,920.90 and 971.01 is: 1,455.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,615.58 : 3,920.90 = 971.01 : x
  2. Step 2: Convert to fraction form
    2,615.58/3,920.90 = 971.01/x
  3. Step 3: Cross multiply
    2,615.58x = 3,920.90 × 971.01
  4. Step 4: Simplify right side
    2,615.58x = 3,807,228.25
  5. Step 5: Solve for x
    x = 3,807,228.25/2,615.58
  6. Step 6: Final answer
    x = 1,455.60

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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.