Home / 1,390.32-2,085.12-416.16

Finding the Fourth Proportional to 1,390.32, 2,085.12 and 416.16

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Solution

The fourth proportional to 1,390.32, 2,085.12 and 416.16 is: 624.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.32 : 2,085.12 = 416.16 : x
  2. Step 2: Convert to fraction form
    1,390.32/2,085.12 = 416.16/x
  3. Step 3: Cross multiply
    1,390.32x = 2,085.12 × 416.16
  4. Step 4: Simplify right side
    1,390.32x = 867,743.54
  5. Step 5: Solve for x
    x = 867,743.54/1,390.32
  6. Step 6: Final answer
    x = 624.13

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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.