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Finding the Fourth Proportional to 838.91, 1,157.70 and 465.88

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Solution

The fourth proportional to 838.91, 1,157.70 and 465.88 is: 642.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.91 : 1,157.70 = 465.88 : x
  2. Step 2: Convert to fraction form
    838.91/1,157.70 = 465.88/x
  3. Step 3: Cross multiply
    838.91x = 1,157.70 × 465.88
  4. Step 4: Simplify right side
    838.91x = 539,341.16
  5. Step 5: Solve for x
    x = 539,341.16/838.91
  6. Step 6: Final answer
    x = 642.91

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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.