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Finding the Fourth Proportional to 1,047.20, 1,569.20 and 989.60

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Solution

The fourth proportional to 1,047.20, 1,569.20 and 989.60 is: 1,482.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.20 : 1,569.20 = 989.60 : x
  2. Step 2: Convert to fraction form
    1,047.20/1,569.20 = 989.60/x
  3. Step 3: Cross multiply
    1,047.20x = 1,569.20 × 989.60
  4. Step 4: Simplify right side
    1,047.20x = 1,552,880.32
  5. Step 5: Solve for x
    x = 1,552,880.32/1,047.20
  6. Step 6: Final answer
    x = 1,482.89

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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.