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Finding the Fourth Proportional to 91,890.70, 128,778.20 and 91,890.70

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Solution

The fourth proportional to 91,890.70, 128,778.20 and 91,890.70 is: 128,778.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,890.70 : 128,778.20 = 91,890.70 : x
  2. Step 2: Convert to fraction form
    91,890.70/128,778.20 = 91,890.70/x
  3. Step 3: Cross multiply
    91,890.70x = 128,778.20 × 91,890.70
  4. Step 4: Simplify right side
    91,890.70x = 11,833,518,942.74
  5. Step 5: Solve for x
    x = 11,833,518,942.74/91,890.70
  6. Step 6: Final answer
    x = 128,778.20

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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.