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Finding the Fourth Proportional to 21,328.56, 29,430.06 and 12,374.22

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Solution

The fourth proportional to 21,328.56, 29,430.06 and 12,374.22 is: 17,074.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,328.56 : 29,430.06 = 12,374.22 : x
  2. Step 2: Convert to fraction form
    21,328.56/29,430.06 = 12,374.22/x
  3. Step 3: Cross multiply
    21,328.56x = 29,430.06 × 12,374.22
  4. Step 4: Simplify right side
    21,328.56x = 364,174,037.05
  5. Step 5: Solve for x
    x = 364,174,037.05/21,328.56
  6. Step 6: Final answer
    x = 17,074.48

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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.