Home / 1,389.42-2,084.13-415.67

Finding the Fourth Proportional to 1,389.42, 2,084.13 and 415.67

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Solution

The fourth proportional to 1,389.42, 2,084.13 and 415.67 is: 623.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.42 : 2,084.13 = 415.67 : x
  2. Step 2: Convert to fraction form
    1,389.42/2,084.13 = 415.67/x
  3. Step 3: Cross multiply
    1,389.42x = 2,084.13 × 415.67
  4. Step 4: Simplify right side
    1,389.42x = 866,299.90
  5. Step 5: Solve for x
    x = 866,299.90/1,389.42
  6. Step 6: Final answer
    x = 623.50

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.