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Finding the Fourth Proportional to 210,561.40, 315,858.66 and 70,320.52

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Solution

The fourth proportional to 210,561.40, 315,858.66 and 70,320.52 is: 105,486.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,561.40 : 315,858.66 = 70,320.52 : x
  2. Step 2: Convert to fraction form
    210,561.40/315,858.66 = 70,320.52/x
  3. Step 3: Cross multiply
    210,561.40x = 315,858.66 × 70,320.52
  4. Step 4: Simplify right side
    210,561.40x = 22,211,345,217.70
  5. Step 5: Solve for x
    x = 22,211,345,217.70/210,561.40
  6. Step 6: Final answer
    x = 105,486.31

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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.