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Finding the Fourth Proportional to 210,405.84, 315,540.60 and 70,126.80

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Solution

The fourth proportional to 210,405.84, 315,540.60 and 70,126.80 is: 105,167.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,405.84 : 315,540.60 = 70,126.80 : x
  2. Step 2: Convert to fraction form
    210,405.84/315,540.60 = 70,126.80/x
  3. Step 3: Cross multiply
    210,405.84x = 315,540.60 × 70,126.80
  4. Step 4: Simplify right side
    210,405.84x = 22,127,852,548.08
  5. Step 5: Solve for x
    x = 22,127,852,548.08/210,405.84
  6. Step 6: Final answer
    x = 105,167.48

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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.