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Finding the Fourth Proportional to 838.60, 1,157.34 and 465.70

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Solution

The fourth proportional to 838.60, 1,157.34 and 465.70 is: 642.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.60 : 1,157.34 = 465.70 : x
  2. Step 2: Convert to fraction form
    838.60/1,157.34 = 465.70/x
  3. Step 3: Cross multiply
    838.60x = 1,157.34 × 465.70
  4. Step 4: Simplify right side
    838.60x = 538,973.24
  5. Step 5: Solve for x
    x = 538,973.24/838.60
  6. Step 6: Final answer
    x = 642.71

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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.