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Finding the Fourth Proportional to 156,461.40, 215,907.69 and 91,920.60

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Solution

The fourth proportional to 156,461.40, 215,907.69 and 91,920.60 is: 126,845.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,461.40 : 215,907.69 = 91,920.60 : x
  2. Step 2: Convert to fraction form
    156,461.40/215,907.69 = 91,920.60/x
  3. Step 3: Cross multiply
    156,461.40x = 215,907.69 × 91,920.60
  4. Step 4: Simplify right side
    156,461.40x = 19,846,364,409.41
  5. Step 5: Solve for x
    x = 19,846,364,409.41/156,461.40
  6. Step 6: Final answer
    x = 126,845.12

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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.