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Finding the Fourth Proportional to 15,387.70, 21,235.04 and 8,314.12

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Solution

The fourth proportional to 15,387.70, 21,235.04 and 8,314.12 is: 11,473.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,387.70 : 21,235.04 = 8,314.12 : x
  2. Step 2: Convert to fraction form
    15,387.70/21,235.04 = 8,314.12/x
  3. Step 3: Cross multiply
    15,387.70x = 21,235.04 × 8,314.12
  4. Step 4: Simplify right side
    15,387.70x = 176,550,670.76
  5. Step 5: Solve for x
    x = 176,550,670.76/15,387.70
  6. Step 6: Final answer
    x = 11,473.49

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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.