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Finding the Fourth Proportional to 51,009.88, 70,391.95 and 28,039.78

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Solution

The fourth proportional to 51,009.88, 70,391.95 and 28,039.78 is: 38,693.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,009.88 : 70,391.95 = 28,039.78 : x
  2. Step 2: Convert to fraction form
    51,009.88/70,391.95 = 28,039.78/x
  3. Step 3: Cross multiply
    51,009.88x = 70,391.95 × 28,039.78
  4. Step 4: Simplify right side
    51,009.88x = 1,973,774,861.87
  5. Step 5: Solve for x
    x = 1,973,774,861.87/51,009.88
  6. Step 6: Final answer
    x = 38,693.97

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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.