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Finding the Fourth Proportional to 1,319.99, 1,980.09 and 442.44

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Solution

The fourth proportional to 1,319.99, 1,980.09 and 442.44 is: 663.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.99 : 1,980.09 = 442.44 : x
  2. Step 2: Convert to fraction form
    1,319.99/1,980.09 = 442.44/x
  3. Step 3: Cross multiply
    1,319.99x = 1,980.09 × 442.44
  4. Step 4: Simplify right side
    1,319.99x = 876,071.02
  5. Step 5: Solve for x
    x = 876,071.02/1,319.99
  6. Step 6: Final answer
    x = 663.70

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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.