Home / 21,389.60-29,503.64-12,885.98

Finding the Fourth Proportional to 21,389.60, 29,503.64 and 12,885.98

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Solution

The fourth proportional to 21,389.60, 29,503.64 and 12,885.98 is: 17,774.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,389.60 : 29,503.64 = 12,885.98 : x
  2. Step 2: Convert to fraction form
    21,389.60/29,503.64 = 12,885.98/x
  3. Step 3: Cross multiply
    21,389.60x = 29,503.64 × 12,885.98
  4. Step 4: Simplify right side
    21,389.60x = 380,183,103.02
  5. Step 5: Solve for x
    x = 380,183,103.02/21,389.60
  6. Step 6: Final answer
    x = 17,774.21

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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.