Home / 285,485.09-393,985.92-156,423.80

Finding the Fourth Proportional to 285,485.09, 393,985.92 and 156,423.80

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Solution

The fourth proportional to 285,485.09, 393,985.92 and 156,423.80 is: 215,873.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,485.09 : 393,985.92 = 156,423.80 : x
  2. Step 2: Convert to fraction form
    285,485.09/393,985.92 = 156,423.80/x
  3. Step 3: Cross multiply
    285,485.09x = 393,985.92 × 156,423.80
  4. Step 4: Simplify right side
    285,485.09x = 61,628,776,324.45
  5. Step 5: Solve for x
    x = 61,628,776,324.45/285,485.09
  6. Step 6: Final answer
    x = 215,873.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.