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Finding the Fourth Proportional to 209,946.80, 314,920.20 and 85,377.20

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Solution

The fourth proportional to 209,946.80, 314,920.20 and 85,377.20 is: 128,065.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,946.80 : 314,920.20 = 85,377.20 : x
  2. Step 2: Convert to fraction form
    209,946.80/314,920.20 = 85,377.20/x
  3. Step 3: Cross multiply
    209,946.80x = 314,920.20 × 85,377.20
  4. Step 4: Simplify right side
    209,946.80x = 26,887,004,899.44
  5. Step 5: Solve for x
    x = 26,887,004,899.44/209,946.80
  6. Step 6: Final answer
    x = 128,065.80

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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.