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Finding the Fourth Proportional to 76,397.80, 105,210.98 and 55,143.40

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Solution

The fourth proportional to 76,397.80, 105,210.98 and 55,143.40 is: 75,940.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,397.80 : 105,210.98 = 55,143.40 : x
  2. Step 2: Convert to fraction form
    76,397.80/105,210.98 = 55,143.40/x
  3. Step 3: Cross multiply
    76,397.80x = 105,210.98 × 55,143.40
  4. Step 4: Simplify right side
    76,397.80x = 5,801,690,615.79
  5. Step 5: Solve for x
    x = 5,801,690,615.79/76,397.80
  6. Step 6: Final answer
    x = 75,940.55

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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.