Home / 1,312.28-1,968.42-479.40

Finding the Fourth Proportional to 1,312.28, 1,968.42 and 479.40

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Solution

The fourth proportional to 1,312.28, 1,968.42 and 479.40 is: 719.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.28 : 1,968.42 = 479.40 : x
  2. Step 2: Convert to fraction form
    1,312.28/1,968.42 = 479.40/x
  3. Step 3: Cross multiply
    1,312.28x = 1,968.42 × 479.40
  4. Step 4: Simplify right side
    1,312.28x = 943,660.55
  5. Step 5: Solve for x
    x = 943,660.55/1,312.28
  6. Step 6: Final answer
    x = 719.10

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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.