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Finding the Fourth Proportional to 950.40, 1,312.20 and 619.68

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Solution

The fourth proportional to 950.40, 1,312.20 and 619.68 is: 855.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    950.40 : 1,312.20 = 619.68 : x
  2. Step 2: Convert to fraction form
    950.40/1,312.20 = 619.68/x
  3. Step 3: Cross multiply
    950.40x = 1,312.20 × 619.68
  4. Step 4: Simplify right side
    950.40x = 813,144.10
  5. Step 5: Solve for x
    x = 813,144.10/950.40
  6. Step 6: Final answer
    x = 855.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.