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Finding the Fourth Proportional to 199,406.60, 299,109.90 and 128,547.80

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Solution

The fourth proportional to 199,406.60, 299,109.90 and 128,547.80 is: 192,821.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    199,406.60 : 299,109.90 = 128,547.80 : x
  2. Step 2: Convert to fraction form
    199,406.60/299,109.90 = 128,547.80/x
  3. Step 3: Cross multiply
    199,406.60x = 299,109.90 × 128,547.80
  4. Step 4: Simplify right side
    199,406.60x = 38,449,919,603.22
  5. Step 5: Solve for x
    x = 38,449,919,603.22/199,406.60
  6. Step 6: Final answer
    x = 192,821.70

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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.