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Finding the Fourth Proportional to 1,285.95, 1,930.58 and 670.08

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Solution

The fourth proportional to 1,285.95, 1,930.58 and 670.08 is: 1,005.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.95 : 1,930.58 = 670.08 : x
  2. Step 2: Convert to fraction form
    1,285.95/1,930.58 = 670.08/x
  3. Step 3: Cross multiply
    1,285.95x = 1,930.58 × 670.08
  4. Step 4: Simplify right side
    1,285.95x = 1,293,643.05
  5. Step 5: Solve for x
    x = 1,293,643.05/1,285.95
  6. Step 6: Final answer
    x = 1,005.98

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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.