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Finding the Fourth Proportional to 210,628.83, 315,943.25 and 70,387.46

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Solution

The fourth proportional to 210,628.83, 315,943.25 and 70,387.46 is: 105,581.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,628.83 : 315,943.25 = 70,387.46 : x
  2. Step 2: Convert to fraction form
    210,628.83/315,943.25 = 70,387.46/x
  3. Step 3: Cross multiply
    210,628.83x = 315,943.25 × 70,387.46
  4. Step 4: Simplify right side
    210,628.83x = 22,238,440,939.99
  5. Step 5: Solve for x
    x = 22,238,440,939.99/210,628.83
  6. Step 6: Final answer
    x = 105,581.18

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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.