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Finding the Fourth Proportional to 13,710.58, 18,920.95 and 8,408.32

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Solution

The fourth proportional to 13,710.58, 18,920.95 and 8,408.32 is: 11,603.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,710.58 : 18,920.95 = 8,408.32 : x
  2. Step 2: Convert to fraction form
    13,710.58/18,920.95 = 8,408.32/x
  3. Step 3: Cross multiply
    13,710.58x = 18,920.95 × 8,408.32
  4. Step 4: Simplify right side
    13,710.58x = 159,093,464.06
  5. Step 5: Solve for x
    x = 159,093,464.06/13,710.58
  6. Step 6: Final answer
    x = 11,603.70

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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.