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Finding the Fourth Proportional to 210,805.80, 315,440.70 and 155,509.80

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Solution

The fourth proportional to 210,805.80, 315,440.70 and 155,509.80 is: 232,698.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,805.80 : 315,440.70 = 155,509.80 : x
  2. Step 2: Convert to fraction form
    210,805.80/315,440.70 = 155,509.80/x
  3. Step 3: Cross multiply
    210,805.80x = 315,440.70 × 155,509.80
  4. Step 4: Simplify right side
    210,805.80x = 49,054,120,168.86
  5. Step 5: Solve for x
    x = 49,054,120,168.86/210,805.80
  6. Step 6: Final answer
    x = 232,698.15

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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.