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Finding the Fourth Proportional to 66,840.50, 92,239.89 and 39,984.14

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Solution

The fourth proportional to 66,840.50, 92,239.89 and 39,984.14 is: 55,178.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,840.50 : 92,239.89 = 39,984.14 : x
  2. Step 2: Convert to fraction form
    66,840.50/92,239.89 = 39,984.14/x
  3. Step 3: Cross multiply
    66,840.50x = 92,239.89 × 39,984.14
  4. Step 4: Simplify right side
    66,840.50x = 3,688,132,675.34
  5. Step 5: Solve for x
    x = 3,688,132,675.34/66,840.50
  6. Step 6: Final answer
    x = 55,178.11

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1.5x scale

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.