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Finding the Fourth Proportional to 989.45, 1,485.14 and 469.80

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Solution

The fourth proportional to 989.45, 1,485.14 and 469.80 is: 705.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.45 : 1,485.14 = 469.80 : x
  2. Step 2: Convert to fraction form
    989.45/1,485.14 = 469.80/x
  3. Step 3: Cross multiply
    989.45x = 1,485.14 × 469.80
  4. Step 4: Simplify right side
    989.45x = 697,719.95
  5. Step 5: Solve for x
    x = 697,719.95/989.45
  6. Step 6: Final answer
    x = 705.16

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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.