Home / 21,288.61-29,378.60-12,215.45

Finding the Fourth Proportional to 21,288.61, 29,378.60 and 12,215.45

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Solution

The fourth proportional to 21,288.61, 29,378.60 and 12,215.45 is: 16,857.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,288.61 : 29,378.60 = 12,215.45 : x
  2. Step 2: Convert to fraction form
    21,288.61/29,378.60 = 12,215.45/x
  3. Step 3: Cross multiply
    21,288.61x = 29,378.60 × 12,215.45
  4. Step 4: Simplify right side
    21,288.61x = 358,872,819.37
  5. Step 5: Solve for x
    x = 358,872,819.37/21,288.61
  6. Step 6: Final answer
    x = 16,857.50

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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.