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Finding the Fourth Proportional to 12,384.95, 18,565.20 and 7,929.93

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Solution

The fourth proportional to 12,384.95, 18,565.20 and 7,929.93 is: 11,887.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,384.95 : 18,565.20 = 7,929.93 : x
  2. Step 2: Convert to fraction form
    12,384.95/18,565.20 = 7,929.93/x
  3. Step 3: Cross multiply
    12,384.95x = 18,565.20 × 7,929.93
  4. Step 4: Simplify right side
    12,384.95x = 147,220,806.06
  5. Step 5: Solve for x
    x = 147,220,806.06/12,384.95
  6. Step 6: Final answer
    x = 11,887.08

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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.