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Finding the Fourth Proportional to 15,703.87, 21,670.08 and 8,987.96

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Solution

The fourth proportional to 15,703.87, 21,670.08 and 8,987.96 is: 12,402.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,703.87 : 21,670.08 = 8,987.96 : x
  2. Step 2: Convert to fraction form
    15,703.87/21,670.08 = 8,987.96/x
  3. Step 3: Cross multiply
    15,703.87x = 21,670.08 × 8,987.96
  4. Step 4: Simplify right side
    15,703.87x = 194,769,812.24
  5. Step 5: Solve for x
    x = 194,769,812.24/15,703.87
  6. Step 6: Final answer
    x = 12,402.66

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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.