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Finding the Fourth Proportional to 1,570.80, 2,355.60 and 955.28

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Solution

The fourth proportional to 1,570.80, 2,355.60 and 955.28 is: 1,432.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,570.80 : 2,355.60 = 955.28 : x
  2. Step 2: Convert to fraction form
    1,570.80/2,355.60 = 955.28/x
  3. Step 3: Cross multiply
    1,570.80x = 2,355.60 × 955.28
  4. Step 4: Simplify right side
    1,570.80x = 2,250,257.57
  5. Step 5: Solve for x
    x = 2,250,257.57/1,570.80
  6. Step 6: Final answer
    x = 1,432.56

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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.