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Finding the Fourth Proportional to 1,438.40, 2,155.20 and 951.20

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Solution

The fourth proportional to 1,438.40, 2,155.20 and 951.20 is: 1,425.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.40 : 2,155.20 = 951.20 : x
  2. Step 2: Convert to fraction form
    1,438.40/2,155.20 = 951.20/x
  3. Step 3: Cross multiply
    1,438.40x = 2,155.20 × 951.20
  4. Step 4: Simplify right side
    1,438.40x = 2,050,026.24
  5. Step 5: Solve for x
    x = 2,050,026.24/1,438.40
  6. Step 6: Final answer
    x = 1,425.21

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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.