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Finding the Fourth Proportional to 91,712.55, 128,485.05 and 91,712.55

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Solution

The fourth proportional to 91,712.55, 128,485.05 and 91,712.55 is: 128,485.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,712.55 : 128,485.05 = 91,712.55 : x
  2. Step 2: Convert to fraction form
    91,712.55/128,485.05 = 91,712.55/x
  3. Step 3: Cross multiply
    91,712.55x = 128,485.05 × 91,712.55
  4. Step 4: Simplify right side
    91,712.55x = 11,783,691,572.38
  5. Step 5: Solve for x
    x = 11,783,691,572.38/91,712.55
  6. Step 6: Final answer
    x = 128,485.05

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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.