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Finding the Fourth Proportional to 66,308.40, 91,485 and 40,788

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Solution

The fourth proportional to 66,308.40, 91,485 and 40,788 is: 56,274.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,308.40 : 91,485 = 40,788 : x
  2. Step 2: Convert to fraction form
    66,308.40/91,485 = 40,788/x
  3. Step 3: Cross multiply
    66,308.40x = 91,485 × 40,788
  4. Step 4: Simplify right side
    66,308.40x = 3,731,490,180
  5. Step 5: Solve for x
    x = 3,731,490,180/66,308.40
  6. Step 6: Final answer
    x = 56,274.77

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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.