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Finding the Fourth Proportional to 207,745.70, 311,618.55 and 128,948.90

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Solution

The fourth proportional to 207,745.70, 311,618.55 and 128,948.90 is: 193,423.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,745.70 : 311,618.55 = 128,948.90 : x
  2. Step 2: Convert to fraction form
    207,745.70/311,618.55 = 128,948.90/x
  3. Step 3: Cross multiply
    207,745.70x = 311,618.55 × 128,948.90
  4. Step 4: Simplify right side
    207,745.70x = 40,182,869,242.10
  5. Step 5: Solve for x
    x = 40,182,869,242.10/207,745.70
  6. Step 6: Final answer
    x = 193,423.35

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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.