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Finding the Fourth Proportional to 1,319.41, 1,820.83 and 729.99

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Solution

The fourth proportional to 1,319.41, 1,820.83 and 729.99 is: 1,007.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.41 : 1,820.83 = 729.99 : x
  2. Step 2: Convert to fraction form
    1,319.41/1,820.83 = 729.99/x
  3. Step 3: Cross multiply
    1,319.41x = 1,820.83 × 729.99
  4. Step 4: Simplify right side
    1,319.41x = 1,329,182.11
  5. Step 5: Solve for x
    x = 1,329,182.11/1,319.41
  6. Step 6: Final answer
    x = 1,007.40

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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.