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Finding the Fourth Proportional to 91,745.30, 128,530.90 and 91,745.30

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Solution

The fourth proportional to 91,745.30, 128,530.90 and 91,745.30 is: 128,530.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,745.30 : 128,530.90 = 91,745.30 : x
  2. Step 2: Convert to fraction form
    91,745.30/128,530.90 = 91,745.30/x
  3. Step 3: Cross multiply
    91,745.30x = 128,530.90 × 91,745.30
  4. Step 4: Simplify right side
    91,745.30x = 11,792,105,979.77
  5. Step 5: Solve for x
    x = 11,792,105,979.77/91,745.30
  6. Step 6: Final answer
    x = 128,530.90

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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.