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Finding the Fourth Proportional to 824.84, 1,138.21 and 470.77

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Solution

The fourth proportional to 824.84, 1,138.21 and 470.77 is: 649.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.84 : 1,138.21 = 470.77 : x
  2. Step 2: Convert to fraction form
    824.84/1,138.21 = 470.77/x
  3. Step 3: Cross multiply
    824.84x = 1,138.21 × 470.77
  4. Step 4: Simplify right side
    824.84x = 535,835.12
  5. Step 5: Solve for x
    x = 535,835.12/824.84
  6. Step 6: Final answer
    x = 649.62

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1.5x scale

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.