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Finding the Fourth Proportional to 91,898.40, 128,920.20 and 91,898.40

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Solution

The fourth proportional to 91,898.40, 128,920.20 and 91,898.40 is: 128,920.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,898.40 : 128,920.20 = 91,898.40 : x
  2. Step 2: Convert to fraction form
    91,898.40/128,920.20 = 91,898.40/x
  3. Step 3: Cross multiply
    91,898.40x = 128,920.20 × 91,898.40
  4. Step 4: Simplify right side
    91,898.40x = 11,847,560,107.68
  5. Step 5: Solve for x
    x = 11,847,560,107.68/91,898.40
  6. Step 6: Final answer
    x = 128,920.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.