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Finding the Fourth Proportional to 838.15, 1,156.71 and 465.16

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Solution

The fourth proportional to 838.15, 1,156.71 and 465.16 is: 641.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.15 : 1,156.71 = 465.16 : x
  2. Step 2: Convert to fraction form
    838.15/1,156.71 = 465.16/x
  3. Step 3: Cross multiply
    838.15x = 1,156.71 × 465.16
  4. Step 4: Simplify right side
    838.15x = 538,055.22
  5. Step 5: Solve for x
    x = 538,055.22/838.15
  6. Step 6: Final answer
    x = 641.96

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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.