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Finding the Fourth Proportional to 91,809.40, 137,714.10 and 39,321.40

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Solution

The fourth proportional to 91,809.40, 137,714.10 and 39,321.40 is: 58,982.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,809.40 : 137,714.10 = 39,321.40 : x
  2. Step 2: Convert to fraction form
    91,809.40/137,714.10 = 39,321.40/x
  3. Step 3: Cross multiply
    91,809.40x = 137,714.10 × 39,321.40
  4. Step 4: Simplify right side
    91,809.40x = 5,415,111,211.74
  5. Step 5: Solve for x
    x = 5,415,111,211.74/91,809.40
  6. Step 6: Final answer
    x = 58,982.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.