Home / 21,011.52-31,461.60-12,680.40

Finding the Fourth Proportional to 21,011.52, 31,461.60 and 12,680.40

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Solution

The fourth proportional to 21,011.52, 31,461.60 and 12,680.40 is: 18,987.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.52 : 31,461.60 = 12,680.40 : x
  2. Step 2: Convert to fraction form
    21,011.52/31,461.60 = 12,680.40/x
  3. Step 3: Cross multiply
    21,011.52x = 31,461.60 × 12,680.40
  4. Step 4: Simplify right side
    21,011.52x = 398,945,672.64
  5. Step 5: Solve for x
    x = 398,945,672.64/21,011.52
  6. Step 6: Final answer
    x = 18,987.00

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.