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Finding the Fourth Proportional to 1,020.47, 1,529.79 and 989.48

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Solution

The fourth proportional to 1,020.47, 1,529.79 and 989.48 is: 1,483.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.47 : 1,529.79 = 989.48 : x
  2. Step 2: Convert to fraction form
    1,020.47/1,529.79 = 989.48/x
  3. Step 3: Cross multiply
    1,020.47x = 1,529.79 × 989.48
  4. Step 4: Simplify right side
    1,020.47x = 1,513,696.72
  5. Step 5: Solve for x
    x = 1,513,696.72/1,020.47
  6. Step 6: Final answer
    x = 1,483.34

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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.