Home / 21,384.18-29,512.21-12,430.90

Finding the Fourth Proportional to 21,384.18, 29,512.21 and 12,430.90

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Solution

The fourth proportional to 21,384.18, 29,512.21 and 12,430.90 is: 17,155.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,384.18 : 29,512.21 = 12,430.90 : x
  2. Step 2: Convert to fraction form
    21,384.18/29,512.21 = 12,430.90/x
  3. Step 3: Cross multiply
    21,384.18x = 29,512.21 × 12,430.90
  4. Step 4: Simplify right side
    21,384.18x = 366,863,331.29
  5. Step 5: Solve for x
    x = 366,863,331.29/21,384.18
  6. Step 6: Final answer
    x = 17,155.83

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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.