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Finding the Fourth Proportional to 51,390.78, 70,913.84 and 28,727.39

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Solution

The fourth proportional to 51,390.78, 70,913.84 and 28,727.39 is: 39,640.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,390.78 : 70,913.84 = 28,727.39 : x
  2. Step 2: Convert to fraction form
    51,390.78/70,913.84 = 28,727.39/x
  3. Step 3: Cross multiply
    51,390.78x = 70,913.84 × 28,727.39
  4. Step 4: Simplify right side
    51,390.78x = 2,037,169,039.87
  5. Step 5: Solve for x
    x = 2,037,169,039.87/51,390.78
  6. Step 6: Final answer
    x = 39,640.75

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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.