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Finding the Fourth Proportional to 8,391, 12,635.45 and 6,215.16

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Solution

The fourth proportional to 8,391, 12,635.45 and 6,215.16 is: 9,359.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,391 : 12,635.45 = 6,215.16 : x
  2. Step 2: Convert to fraction form
    8,391/12,635.45 = 6,215.16/x
  3. Step 3: Cross multiply
    8,391x = 12,635.45 × 6,215.16
  4. Step 4: Simplify right side
    8,391x = 78,531,343.42
  5. Step 5: Solve for x
    x = 78,531,343.42/8,391
  6. Step 6: Final answer
    x = 9,359.00

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.