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Finding the Fourth Proportional to 66,406.32, 91,730.16 and 61,682.40

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Solution

The fourth proportional to 66,406.32, 91,730.16 and 61,682.40 is: 85,204.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,406.32 : 91,730.16 = 61,682.40 : x
  2. Step 2: Convert to fraction form
    66,406.32/91,730.16 = 61,682.40/x
  3. Step 3: Cross multiply
    66,406.32x = 91,730.16 × 61,682.40
  4. Step 4: Simplify right side
    66,406.32x = 5,658,136,421.18
  5. Step 5: Solve for x
    x = 5,658,136,421.18/66,406.32
  6. Step 6: Final answer
    x = 85,204.79

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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.