Home / 1,478.21-2,216.90-438.17

Finding the Fourth Proportional to 1,478.21, 2,216.90 and 438.17

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Solution

The fourth proportional to 1,478.21, 2,216.90 and 438.17 is: 657.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.21 : 2,216.90 = 438.17 : x
  2. Step 2: Convert to fraction form
    1,478.21/2,216.90 = 438.17/x
  3. Step 3: Cross multiply
    1,478.21x = 2,216.90 × 438.17
  4. Step 4: Simplify right side
    1,478.21x = 971,369.08
  5. Step 5: Solve for x
    x = 971,369.08/1,478.21
  6. Step 6: Final answer
    x = 657.13

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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.