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Finding the Fourth Proportional to 784.48, 1,176.84 and 264.40

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Solution

The fourth proportional to 784.48, 1,176.84 and 264.40 is: 396.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.48 : 1,176.84 = 264.40 : x
  2. Step 2: Convert to fraction form
    784.48/1,176.84 = 264.40/x
  3. Step 3: Cross multiply
    784.48x = 1,176.84 × 264.40
  4. Step 4: Simplify right side
    784.48x = 311,156.50
  5. Step 5: Solve for x
    x = 311,156.50/784.48
  6. Step 6: Final answer
    x = 396.64

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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.