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Finding the Fourth Proportional to 1,408.19, 1,943.30 and 778.68

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Solution

The fourth proportional to 1,408.19, 1,943.30 and 778.68 is: 1,074.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.19 : 1,943.30 = 778.68 : x
  2. Step 2: Convert to fraction form
    1,408.19/1,943.30 = 778.68/x
  3. Step 3: Cross multiply
    1,408.19x = 1,943.30 × 778.68
  4. Step 4: Simplify right side
    1,408.19x = 1,513,210.79
  5. Step 5: Solve for x
    x = 1,513,210.79/1,408.19
  6. Step 6: Final answer
    x = 1,074.58

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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.