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Finding the Fourth Proportional to 405,693.80, 608,411.10 and 168,979.40

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Solution

The fourth proportional to 405,693.80, 608,411.10 and 168,979.40 is: 253,415.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,693.80 : 608,411.10 = 168,979.40 : x
  2. Step 2: Convert to fraction form
    405,693.80/608,411.10 = 168,979.40/x
  3. Step 3: Cross multiply
    405,693.80x = 608,411.10 × 168,979.40
  4. Step 4: Simplify right side
    405,693.80x = 102,808,942,631.34
  5. Step 5: Solve for x
    x = 102,808,942,631.34/405,693.80
  6. Step 6: Final answer
    x = 253,415.12

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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.