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Finding the Fourth Proportional to 790.20, 1,184.64 and 425.40

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Solution

The fourth proportional to 790.20, 1,184.64 and 425.40 is: 637.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.20 : 1,184.64 = 425.40 : x
  2. Step 2: Convert to fraction form
    790.20/1,184.64 = 425.40/x
  3. Step 3: Cross multiply
    790.20x = 1,184.64 × 425.40
  4. Step 4: Simplify right side
    790.20x = 503,945.86
  5. Step 5: Solve for x
    x = 503,945.86/790.20
  6. Step 6: Final answer
    x = 637.74

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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.