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Finding the Fourth Proportional to 1,047.80, 1,571.70 and 891.20

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Solution

The fourth proportional to 1,047.80, 1,571.70 and 891.20 is: 1,336.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.80 : 1,571.70 = 891.20 : x
  2. Step 2: Convert to fraction form
    1,047.80/1,571.70 = 891.20/x
  3. Step 3: Cross multiply
    1,047.80x = 1,571.70 × 891.20
  4. Step 4: Simplify right side
    1,047.80x = 1,400,699.04
  5. Step 5: Solve for x
    x = 1,400,699.04/1,047.80
  6. Step 6: Final answer
    x = 1,336.80

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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.