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Finding the Fourth Proportional to 66,387.98, 91,622.94 and 40,889.18

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Solution

The fourth proportional to 66,387.98, 91,622.94 and 40,889.18 is: 56,431.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,387.98 : 91,622.94 = 40,889.18 : x
  2. Step 2: Convert to fraction form
    66,387.98/91,622.94 = 40,889.18/x
  3. Step 3: Cross multiply
    66,387.98x = 91,622.94 × 40,889.18
  4. Step 4: Simplify right side
    66,387.98x = 3,746,386,885.79
  5. Step 5: Solve for x
    x = 3,746,386,885.79/66,387.98
  6. Step 6: Final answer
    x = 56,431.70

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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.