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Finding the Fourth Proportional to 66,242.40, 91,437.98 and 39,384.78

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Solution

The fourth proportional to 66,242.40, 91,437.98 and 39,384.78 is: 54,364.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,242.40 : 91,437.98 = 39,384.78 : x
  2. Step 2: Convert to fraction form
    66,242.40/91,437.98 = 39,384.78/x
  3. Step 3: Cross multiply
    66,242.40x = 91,437.98 × 39,384.78
  4. Step 4: Simplify right side
    66,242.40x = 3,601,264,725.94
  5. Step 5: Solve for x
    x = 3,601,264,725.94/66,242.40
  6. Step 6: Final answer
    x = 54,364.95

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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.