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Finding the Fourth Proportional to 824.76, 1,138.27 and 470.81

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Solution

The fourth proportional to 824.76, 1,138.27 and 470.81 is: 649.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.76 : 1,138.27 = 470.81 : x
  2. Step 2: Convert to fraction form
    824.76/1,138.27 = 470.81/x
  3. Step 3: Cross multiply
    824.76x = 1,138.27 × 470.81
  4. Step 4: Simplify right side
    824.76x = 535,908.90
  5. Step 5: Solve for x
    x = 535,908.90/824.76
  6. Step 6: Final answer
    x = 649.78

Related Problems

Find fourth proportional to 412.38, 569.14 and 235.41
Half scale
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Double scale
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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.