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Finding the Fourth Proportional to 257,085.80, 385,628.70 and 90,873.80

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Solution

The fourth proportional to 257,085.80, 385,628.70 and 90,873.80 is: 136,310.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,085.80 : 385,628.70 = 90,873.80 : x
  2. Step 2: Convert to fraction form
    257,085.80/385,628.70 = 90,873.80/x
  3. Step 3: Cross multiply
    257,085.80x = 385,628.70 × 90,873.80
  4. Step 4: Simplify right side
    257,085.80x = 35,043,545,358.06
  5. Step 5: Solve for x
    x = 35,043,545,358.06/257,085.80
  6. Step 6: Final answer
    x = 136,310.70

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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.