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Finding the Fourth Proportional to 19,938.80, 29,908.20 and 19,031.60

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Solution

The fourth proportional to 19,938.80, 29,908.20 and 19,031.60 is: 28,547.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,938.80 : 29,908.20 = 19,031.60 : x
  2. Step 2: Convert to fraction form
    19,938.80/29,908.20 = 19,031.60/x
  3. Step 3: Cross multiply
    19,938.80x = 29,908.20 × 19,031.60
  4. Step 4: Simplify right side
    19,938.80x = 569,200,899.12
  5. Step 5: Solve for x
    x = 569,200,899.12/19,938.80
  6. Step 6: Final answer
    x = 28,547.40

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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.