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Finding the Fourth Proportional to 210,526.80, 315,636.60 and 85,803.60

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Solution

The fourth proportional to 210,526.80, 315,636.60 and 85,803.60 is: 128,642.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,526.80 : 315,636.60 = 85,803.60 : x
  2. Step 2: Convert to fraction form
    210,526.80/315,636.60 = 85,803.60/x
  3. Step 3: Cross multiply
    210,526.80x = 315,636.60 × 85,803.60
  4. Step 4: Simplify right side
    210,526.80x = 27,082,756,571.76
  5. Step 5: Solve for x
    x = 27,082,756,571.76/210,526.80
  6. Step 6: Final answer
    x = 128,642.80

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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.