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Finding the Fourth Proportional to 1,570.56, 2,166.26 and 980.88

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Solution

The fourth proportional to 1,570.56, 2,166.26 and 980.88 is: 1,352.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,570.56 : 2,166.26 = 980.88 : x
  2. Step 2: Convert to fraction form
    1,570.56/2,166.26 = 980.88/x
  3. Step 3: Cross multiply
    1,570.56x = 2,166.26 × 980.88
  4. Step 4: Simplify right side
    1,570.56x = 2,124,836.20
  5. Step 5: Solve for x
    x = 2,124,836.20/1,570.56
  6. Step 6: Final answer
    x = 1,352.92

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1.5x scale

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.