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Finding the Fourth Proportional to 8,235.90, 12,368.70 and 7,215.30

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Solution

The fourth proportional to 8,235.90, 12,368.70 and 7,215.30 is: 10,835.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,235.90 : 12,368.70 = 7,215.30 : x
  2. Step 2: Convert to fraction form
    8,235.90/12,368.70 = 7,215.30/x
  3. Step 3: Cross multiply
    8,235.90x = 12,368.70 × 7,215.30
  4. Step 4: Simplify right side
    8,235.90x = 89,243,881.11
  5. Step 5: Solve for x
    x = 89,243,881.11/8,235.90
  6. Step 6: Final answer
    x = 10,835.96

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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.