Home / 1,285.18-1,927.08-419.38

Finding the Fourth Proportional to 1,285.18, 1,927.08 and 419.38

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Solution

The fourth proportional to 1,285.18, 1,927.08 and 419.38 is: 628.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.18 : 1,927.08 = 419.38 : x
  2. Step 2: Convert to fraction form
    1,285.18/1,927.08 = 419.38/x
  3. Step 3: Cross multiply
    1,285.18x = 1,927.08 × 419.38
  4. Step 4: Simplify right side
    1,285.18x = 808,178.81
  5. Step 5: Solve for x
    x = 808,178.81/1,285.18
  6. Step 6: Final answer
    x = 628.84

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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.