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Finding the Fourth Proportional to 66,485.57, 91,703.12 and 39,607.34

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Solution

The fourth proportional to 66,485.57, 91,703.12 and 39,607.34 is: 54,630.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,485.57 : 91,703.12 = 39,607.34 : x
  2. Step 2: Convert to fraction form
    66,485.57/91,703.12 = 39,607.34/x
  3. Step 3: Cross multiply
    66,485.57x = 91,703.12 × 39,607.34
  4. Step 4: Simplify right side
    66,485.57x = 3,632,115,996.35
  5. Step 5: Solve for x
    x = 3,632,115,996.35/66,485.57
  6. Step 6: Final answer
    x = 54,630.14

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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.