Home / 14,390.80-19,857.86-8,421.28

Finding the Fourth Proportional to 14,390.80, 19,857.86 and 8,421.28

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Solution

The fourth proportional to 14,390.80, 19,857.86 and 8,421.28 is: 11,620.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,390.80 : 19,857.86 = 8,421.28 : x
  2. Step 2: Convert to fraction form
    14,390.80/19,857.86 = 8,421.28/x
  3. Step 3: Cross multiply
    14,390.80x = 19,857.86 × 8,421.28
  4. Step 4: Simplify right side
    14,390.80x = 167,228,599.26
  5. Step 5: Solve for x
    x = 167,228,599.26/14,390.80
  6. Step 6: Final answer
    x = 11,620.52

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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.