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Finding the Fourth Proportional to 989.77, 1,484.73 and 259.40

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Solution

The fourth proportional to 989.77, 1,484.73 and 259.40 is: 389.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.77 : 1,484.73 = 259.40 : x
  2. Step 2: Convert to fraction form
    989.77/1,484.73 = 259.40/x
  3. Step 3: Cross multiply
    989.77x = 1,484.73 × 259.40
  4. Step 4: Simplify right side
    989.77x = 385,142.67
  5. Step 5: Solve for x
    x = 385,142.67/989.77
  6. Step 6: Final answer
    x = 389.12

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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.