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Finding the Fourth Proportional to 210,495.65, 315,530.72 and 90,630.78

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Solution

The fourth proportional to 210,495.65, 315,530.72 and 90,630.78 is: 135,854.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,495.65 : 315,530.72 = 90,630.78 : x
  2. Step 2: Convert to fraction form
    210,495.65/315,530.72 = 90,630.78/x
  3. Step 3: Cross multiply
    210,495.65x = 315,530.72 × 90,630.78
  4. Step 4: Simplify right side
    210,495.65x = 28,596,794,814.41
  5. Step 5: Solve for x
    x = 28,596,794,814.41/210,495.65
  6. Step 6: Final answer
    x = 135,854.57

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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.