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Finding the Fourth Proportional to 200,031.80, 300,047.70 and 66,916.40

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Solution

The fourth proportional to 200,031.80, 300,047.70 and 66,916.40 is: 100,374.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    200,031.80 : 300,047.70 = 66,916.40 : x
  2. Step 2: Convert to fraction form
    200,031.80/300,047.70 = 66,916.40/x
  3. Step 3: Cross multiply
    200,031.80x = 300,047.70 × 66,916.40
  4. Step 4: Simplify right side
    200,031.80x = 20,078,111,912.28
  5. Step 5: Solve for x
    x = 20,078,111,912.28/200,031.80
  6. Step 6: Final answer
    x = 100,374.60

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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.