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Finding the Fourth Proportional to 51,087, 70,503.30 and 28,731

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Solution

The fourth proportional to 51,087, 70,503.30 and 28,731 is: 39,650.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,087 : 70,503.30 = 28,731 : x
  2. Step 2: Convert to fraction form
    51,087/70,503.30 = 28,731/x
  3. Step 3: Cross multiply
    51,087x = 70,503.30 × 28,731
  4. Step 4: Simplify right side
    51,087x = 2,025,630,312.30
  5. Step 5: Solve for x
    x = 2,025,630,312.30/51,087
  6. Step 6: Final answer
    x = 39,650.60

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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.