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Finding the Fourth Proportional to 66,509.10, 91,795.68 and 39,638.16

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Solution

The fourth proportional to 66,509.10, 91,795.68 and 39,638.16 is: 54,708.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,509.10 : 91,795.68 = 39,638.16 : x
  2. Step 2: Convert to fraction form
    66,509.10/91,795.68 = 39,638.16/x
  3. Step 3: Cross multiply
    66,509.10x = 91,795.68 × 39,638.16
  4. Step 4: Simplify right side
    66,509.10x = 3,638,611,851.15
  5. Step 5: Solve for x
    x = 3,638,611,851.15/66,509.10
  6. Step 6: Final answer
    x = 54,708.48

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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.