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Finding the Fourth Proportional to 66,309.40, 91,486.38 and 40,789

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Solution

The fourth proportional to 66,309.40, 91,486.38 and 40,789 is: 56,276.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,309.40 : 91,486.38 = 40,789 : x
  2. Step 2: Convert to fraction form
    66,309.40/91,486.38 = 40,789/x
  3. Step 3: Cross multiply
    66,309.40x = 91,486.38 × 40,789
  4. Step 4: Simplify right side
    66,309.40x = 3,731,637,953.82
  5. Step 5: Solve for x
    x = 3,731,637,953.82/66,309.40
  6. Step 6: Final answer
    x = 56,276.15

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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.