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Finding the Fourth Proportional to 666,128.72, 999,205.42 and 216,848

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Solution

The fourth proportional to 666,128.72, 999,205.42 and 216,848 is: 325,276.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,128.72 : 999,205.42 = 216,848 : x
  2. Step 2: Convert to fraction form
    666,128.72/999,205.42 = 216,848/x
  3. Step 3: Cross multiply
    666,128.72x = 999,205.42 × 216,848
  4. Step 4: Simplify right side
    666,128.72x = 216,675,696,916.16
  5. Step 5: Solve for x
    x = 216,675,696,916.16/666,128.72
  6. Step 6: Final answer
    x = 325,276.02

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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.