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Finding the Fourth Proportional to 989.88, 1,484.82 and 259.52

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Solution

The fourth proportional to 989.88, 1,484.82 and 259.52 is: 389.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.88 : 1,484.82 = 259.52 : x
  2. Step 2: Convert to fraction form
    989.88/1,484.82 = 259.52/x
  3. Step 3: Cross multiply
    989.88x = 1,484.82 × 259.52
  4. Step 4: Simplify right side
    989.88x = 385,340.49
  5. Step 5: Solve for x
    x = 385,340.49/989.88
  6. Step 6: Final answer
    x = 389.28

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Double scale
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Similar ratio
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1.5x scale

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.