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Finding the Fourth Proportional to 210,378.79, 315,570.98 and 70,137.46

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Solution

The fourth proportional to 210,378.79, 315,570.98 and 70,137.46 is: 105,207.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,378.79 : 315,570.98 = 70,137.46 : x
  2. Step 2: Convert to fraction form
    210,378.79/315,570.98 = 70,137.46/x
  3. Step 3: Cross multiply
    210,378.79x = 315,570.98 × 70,137.46
  4. Step 4: Simplify right side
    210,378.79x = 22,133,346,986.91
  5. Step 5: Solve for x
    x = 22,133,346,986.91/210,378.79
  6. Step 6: Final answer
    x = 105,207.12

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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.