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Finding the Fourth Proportional to 91,901.90, 128,925.10 and 91,901.90

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Solution

The fourth proportional to 91,901.90, 128,925.10 and 91,901.90 is: 128,925.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,901.90 : 128,925.10 = 91,901.90 : x
  2. Step 2: Convert to fraction form
    91,901.90/128,925.10 = 91,901.90/x
  3. Step 3: Cross multiply
    91,901.90x = 128,925.10 × 91,901.90
  4. Step 4: Simplify right side
    91,901.90x = 11,848,461,647.69
  5. Step 5: Solve for x
    x = 11,848,461,647.69/91,901.90
  6. Step 6: Final answer
    x = 128,925.10

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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.