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Finding the Fourth Proportional to 6,670.86, 10,005.12 and 1,990.74

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Solution

The fourth proportional to 6,670.86, 10,005.12 and 1,990.74 is: 2,985.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,670.86 : 10,005.12 = 1,990.74 : x
  2. Step 2: Convert to fraction form
    6,670.86/10,005.12 = 1,990.74/x
  3. Step 3: Cross multiply
    6,670.86x = 10,005.12 × 1,990.74
  4. Step 4: Simplify right side
    6,670.86x = 19,917,592.59
  5. Step 5: Solve for x
    x = 19,917,592.59/6,670.86
  6. Step 6: Final answer
    x = 2,985.76

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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.