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Finding the Fourth Proportional to 834.76, 1,151.94 and 485.40

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Solution

The fourth proportional to 834.76, 1,151.94 and 485.40 is: 669.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    834.76 : 1,151.94 = 485.40 : x
  2. Step 2: Convert to fraction form
    834.76/1,151.94 = 485.40/x
  3. Step 3: Cross multiply
    834.76x = 1,151.94 × 485.40
  4. Step 4: Simplify right side
    834.76x = 559,151.68
  5. Step 5: Solve for x
    x = 559,151.68/834.76
  6. Step 6: Final answer
    x = 669.84

Related Problems

Find fourth proportional to 417.38, 575.97 and 242.70
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.