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Finding the Fourth Proportional to 949.67, 1,421.95 and 619.79

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Solution

The fourth proportional to 949.67, 1,421.95 and 619.79 is: 928.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.67 : 1,421.95 = 619.79 : x
  2. Step 2: Convert to fraction form
    949.67/1,421.95 = 619.79/x
  3. Step 3: Cross multiply
    949.67x = 1,421.95 × 619.79
  4. Step 4: Simplify right side
    949.67x = 881,312.64
  5. Step 5: Solve for x
    x = 881,312.64/949.67
  6. Step 6: Final answer
    x = 928.02

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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.