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Finding the Fourth Proportional to 76,398.80, 105,212.35 and 55,144.40

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Solution

The fourth proportional to 76,398.80, 105,212.35 and 55,144.40 is: 75,941.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,398.80 : 105,212.35 = 55,144.40 : x
  2. Step 2: Convert to fraction form
    76,398.80/105,212.35 = 55,144.40/x
  3. Step 3: Cross multiply
    76,398.80x = 105,212.35 × 55,144.40
  4. Step 4: Simplify right side
    76,398.80x = 5,801,871,913.34
  5. Step 5: Solve for x
    x = 5,801,871,913.34/76,398.80
  6. Step 6: Final answer
    x = 75,941.92

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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.