Home / 21,303.77-31,920.35-12,958.55

Finding the Fourth Proportional to 21,303.77, 31,920.35 and 12,958.55

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Solution

The fourth proportional to 21,303.77, 31,920.35 and 12,958.55 is: 19,416.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,303.77 : 31,920.35 = 12,958.55 : x
  2. Step 2: Convert to fraction form
    21,303.77/31,920.35 = 12,958.55/x
  3. Step 3: Cross multiply
    21,303.77x = 31,920.35 × 12,958.55
  4. Step 4: Simplify right side
    21,303.77x = 413,641,227.10
  5. Step 5: Solve for x
    x = 413,641,227.10/21,303.77
  6. Step 6: Final answer
    x = 19,416.34

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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.