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Finding the Fourth Proportional to 66,811.80, 92,208.06 and 38,518.50

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Solution

The fourth proportional to 66,811.80, 92,208.06 and 38,518.50 is: 53,160.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,811.80 : 92,208.06 = 38,518.50 : x
  2. Step 2: Convert to fraction form
    66,811.80/92,208.06 = 38,518.50/x
  3. Step 3: Cross multiply
    66,811.80x = 92,208.06 × 38,518.50
  4. Step 4: Simplify right side
    66,811.80x = 3,551,716,159.11
  5. Step 5: Solve for x
    x = 3,551,716,159.11/66,811.80
  6. Step 6: Final answer
    x = 53,160.01

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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.