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Finding the Fourth Proportional to 280,705.40, 421,058.10 and 162,315.80

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Solution

The fourth proportional to 280,705.40, 421,058.10 and 162,315.80 is: 243,473.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,705.40 : 421,058.10 = 162,315.80 : x
  2. Step 2: Convert to fraction form
    280,705.40/421,058.10 = 162,315.80/x
  3. Step 3: Cross multiply
    280,705.40x = 421,058.10 × 162,315.80
  4. Step 4: Simplify right side
    280,705.40x = 68,344,382,347.98
  5. Step 5: Solve for x
    x = 68,344,382,347.98/280,705.40
  6. Step 6: Final answer
    x = 243,473.70

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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.