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Finding the Fourth Proportional to 8,670.20, 13,005.30 and 3,990.20

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Solution

The fourth proportional to 8,670.20, 13,005.30 and 3,990.20 is: 5,985.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,670.20 : 13,005.30 = 3,990.20 : x
  2. Step 2: Convert to fraction form
    8,670.20/13,005.30 = 3,990.20/x
  3. Step 3: Cross multiply
    8,670.20x = 13,005.30 × 3,990.20
  4. Step 4: Simplify right side
    8,670.20x = 51,893,748.06
  5. Step 5: Solve for x
    x = 51,893,748.06/8,670.20
  6. Step 6: Final answer
    x = 5,985.30

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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.