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Finding the Fourth Proportional to 199,638.60, 299,457.90 and 128,779.80

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Solution

The fourth proportional to 199,638.60, 299,457.90 and 128,779.80 is: 193,169.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    199,638.60 : 299,457.90 = 128,779.80 : x
  2. Step 2: Convert to fraction form
    199,638.60/299,457.90 = 128,779.80/x
  3. Step 3: Cross multiply
    199,638.60x = 299,457.90 × 128,779.80
  4. Step 4: Simplify right side
    199,638.60x = 38,564,128,470.42
  5. Step 5: Solve for x
    x = 38,564,128,470.42/199,638.60
  6. Step 6: Final answer
    x = 193,169.70

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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.