Home / 1,318.16-1,977.35-393.65

Finding the Fourth Proportional to 1,318.16, 1,977.35 and 393.65

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Solution

The fourth proportional to 1,318.16, 1,977.35 and 393.65 is: 590.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.16 : 1,977.35 = 393.65 : x
  2. Step 2: Convert to fraction form
    1,318.16/1,977.35 = 393.65/x
  3. Step 3: Cross multiply
    1,318.16x = 1,977.35 × 393.65
  4. Step 4: Simplify right side
    1,318.16x = 778,379.39
  5. Step 5: Solve for x
    x = 778,379.39/1,318.16
  6. Step 6: Final answer
    x = 590.50

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Double scale
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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.