Home / 21,215.16-29,280.48-12,261.12

Finding the Fourth Proportional to 21,215.16, 29,280.48 and 12,261.12

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Solution

The fourth proportional to 21,215.16, 29,280.48 and 12,261.12 is: 16,922.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,215.16 : 29,280.48 = 12,261.12 : x
  2. Step 2: Convert to fraction form
    21,215.16/29,280.48 = 12,261.12/x
  3. Step 3: Cross multiply
    21,215.16x = 29,280.48 × 12,261.12
  4. Step 4: Simplify right side
    21,215.16x = 359,011,478.94
  5. Step 5: Solve for x
    x = 359,011,478.94/21,215.16
  6. Step 6: Final answer
    x = 16,922.40

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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.