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Finding the Fourth Proportional to 1,559.96, 2,153.86 and 971

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Solution

The fourth proportional to 1,559.96, 2,153.86 and 971 is: 1,340.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,559.96 : 2,153.86 = 971 : x
  2. Step 2: Convert to fraction form
    1,559.96/2,153.86 = 971/x
  3. Step 3: Cross multiply
    1,559.96x = 2,153.86 × 971
  4. Step 4: Simplify right side
    1,559.96x = 2,091,398.06
  5. Step 5: Solve for x
    x = 2,091,398.06/1,559.96
  6. Step 6: Final answer
    x = 1,340.67

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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.