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Finding the Fourth Proportional to 8,420.34, 12,630.50 and 2,870.88

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Solution

The fourth proportional to 8,420.34, 12,630.50 and 2,870.88 is: 4,306.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,420.34 : 12,630.50 = 2,870.88 : x
  2. Step 2: Convert to fraction form
    8,420.34/12,630.50 = 2,870.88/x
  3. Step 3: Cross multiply
    8,420.34x = 12,630.50 × 2,870.88
  4. Step 4: Simplify right side
    8,420.34x = 36,260,649.84
  5. Step 5: Solve for x
    x = 36,260,649.84/8,420.34
  6. Step 6: Final answer
    x = 4,306.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.