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Finding the Fourth Proportional to 51,390.39, 70,915.84 and 28,724.87

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Solution

The fourth proportional to 51,390.39, 70,915.84 and 28,724.87 is: 39,638.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,390.39 : 70,915.84 = 28,724.87 : x
  2. Step 2: Convert to fraction form
    51,390.39/70,915.84 = 28,724.87/x
  3. Step 3: Cross multiply
    51,390.39x = 70,915.84 × 28,724.87
  4. Step 4: Simplify right side
    51,390.39x = 2,037,048,284.94
  5. Step 5: Solve for x
    x = 2,037,048,284.94/51,390.39
  6. Step 6: Final answer
    x = 39,638.70

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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.