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Finding the Fourth Proportional to 72,020.80, 108,128.40 and 57,246.40

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Solution

The fourth proportional to 72,020.80, 108,128.40 and 57,246.40 is: 85,946.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,020.80 : 108,128.40 = 57,246.40 : x
  2. Step 2: Convert to fraction form
    72,020.80/108,128.40 = 57,246.40/x
  3. Step 3: Cross multiply
    72,020.80x = 108,128.40 × 57,246.40
  4. Step 4: Simplify right side
    72,020.80x = 6,189,961,637.76
  5. Step 5: Solve for x
    x = 6,189,961,637.76/72,020.80
  6. Step 6: Final answer
    x = 85,946.86

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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.