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Finding the Fourth Proportional to 210,630.80, 315,946.20 and 70,389.42

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Solution

The fourth proportional to 210,630.80, 315,946.20 and 70,389.42 is: 105,584.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,630.80 : 315,946.20 = 70,389.42 : x
  2. Step 2: Convert to fraction form
    210,630.80/315,946.20 = 70,389.42/x
  3. Step 3: Cross multiply
    210,630.80x = 315,946.20 × 70,389.42
  4. Step 4: Simplify right side
    210,630.80x = 22,239,270,625.56
  5. Step 5: Solve for x
    x = 22,239,270,625.56/210,630.80
  6. Step 6: Final answer
    x = 105,584.14

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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.