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Finding the Fourth Proportional to 408,547.55, 612,919.74 and 128,064.80

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Solution

The fourth proportional to 408,547.55, 612,919.74 and 128,064.80 is: 192,128.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,547.55 : 612,919.74 = 128,064.80 : x
  2. Step 2: Convert to fraction form
    408,547.55/612,919.74 = 128,064.80/x
  3. Step 3: Cross multiply
    408,547.55x = 612,919.74 × 128,064.80
  4. Step 4: Simplify right side
    408,547.55x = 78,493,441,403.47
  5. Step 5: Solve for x
    x = 78,493,441,403.47/408,547.55
  6. Step 6: Final answer
    x = 192,128.04

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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.