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Finding the Fourth Proportional to 1,315.50, 1,817.73 and 980.73

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Solution

The fourth proportional to 1,315.50, 1,817.73 and 980.73 is: 1,355.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.50 : 1,817.73 = 980.73 : x
  2. Step 2: Convert to fraction form
    1,315.50/1,817.73 = 980.73/x
  3. Step 3: Cross multiply
    1,315.50x = 1,817.73 × 980.73
  4. Step 4: Simplify right side
    1,315.50x = 1,782,702.34
  5. Step 5: Solve for x
    x = 1,782,702.34/1,315.50
  6. Step 6: Final answer
    x = 1,355.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.