Home / 1,285.80-1,927.70-636.99

Finding the Fourth Proportional to 1,285.80, 1,927.70 and 636.99

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Solution

The fourth proportional to 1,285.80, 1,927.70 and 636.99 is: 954.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.80 : 1,927.70 = 636.99 : x
  2. Step 2: Convert to fraction form
    1,285.80/1,927.70 = 636.99/x
  3. Step 3: Cross multiply
    1,285.80x = 1,927.70 × 636.99
  4. Step 4: Simplify right side
    1,285.80x = 1,227,925.62
  5. Step 5: Solve for x
    x = 1,227,925.62/1,285.80
  6. Step 6: Final answer
    x = 954.99

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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.