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Finding the Fourth Proportional to 72,215.40, 108,128.70 and 72,215.40

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Solution

The fourth proportional to 72,215.40, 108,128.70 and 72,215.40 is: 108,128.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,215.40 : 108,128.70 = 72,215.40 : x
  2. Step 2: Convert to fraction form
    72,215.40/108,128.70 = 72,215.40/x
  3. Step 3: Cross multiply
    72,215.40x = 108,128.70 × 72,215.40
  4. Step 4: Simplify right side
    72,215.40x = 7,808,557,321.98
  5. Step 5: Solve for x
    x = 7,808,557,321.98/72,215.40
  6. Step 6: Final answer
    x = 108,128.70

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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.