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Finding the Fourth Proportional to 9,215.10, 13,822.65 and 7,890.30

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Solution

The fourth proportional to 9,215.10, 13,822.65 and 7,890.30 is: 11,835.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,215.10 : 13,822.65 = 7,890.30 : x
  2. Step 2: Convert to fraction form
    9,215.10/13,822.65 = 7,890.30/x
  3. Step 3: Cross multiply
    9,215.10x = 13,822.65 × 7,890.30
  4. Step 4: Simplify right side
    9,215.10x = 109,064,855.30
  5. Step 5: Solve for x
    x = 109,064,855.30/9,215.10
  6. Step 6: Final answer
    x = 11,835.45

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Double scale
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Similar ratio
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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.