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Finding the Fourth Proportional to 210,220.65, 315,143.48 and 77,069.88

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Solution

The fourth proportional to 210,220.65, 315,143.48 and 77,069.88 is: 115,536.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,220.65 : 315,143.48 = 77,069.88 : x
  2. Step 2: Convert to fraction form
    210,220.65/315,143.48 = 77,069.88/x
  3. Step 3: Cross multiply
    210,220.65x = 315,143.48 × 77,069.88
  4. Step 4: Simplify right side
    210,220.65x = 24,288,070,379.06
  5. Step 5: Solve for x
    x = 24,288,070,379.06/210,220.65
  6. Step 6: Final answer
    x = 115,536.08

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1.5x scale

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.