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Finding the Fourth Proportional to 91,290.78, 125,980.41 and 51,011.48

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Solution

The fourth proportional to 91,290.78, 125,980.41 and 51,011.48 is: 70,395.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,290.78 : 125,980.41 = 51,011.48 : x
  2. Step 2: Convert to fraction form
    91,290.78/125,980.41 = 51,011.48/x
  3. Step 3: Cross multiply
    91,290.78x = 125,980.41 × 51,011.48
  4. Step 4: Simplify right side
    91,290.78x = 6,426,447,165.11
  5. Step 5: Solve for x
    x = 6,426,447,165.11/91,290.78
  6. Step 6: Final answer
    x = 70,395.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.