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Finding the Fourth Proportional to 19,640.80, 29,461.20 and 12,642.40

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Solution

The fourth proportional to 19,640.80, 29,461.20 and 12,642.40 is: 18,963.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,640.80 : 29,461.20 = 12,642.40 : x
  2. Step 2: Convert to fraction form
    19,640.80/29,461.20 = 12,642.40/x
  3. Step 3: Cross multiply
    19,640.80x = 29,461.20 × 12,642.40
  4. Step 4: Simplify right side
    19,640.80x = 372,460,274.88
  5. Step 5: Solve for x
    x = 372,460,274.88/19,640.80
  6. Step 6: Final answer
    x = 18,963.60

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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.