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Finding the Fourth Proportional to 879,691.32, 1,213,845 and 492,486.66

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Solution

The fourth proportional to 879,691.32, 1,213,845 and 492,486.66 is: 679,559.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    879,691.32 : 1,213,845 = 492,486.66 : x
  2. Step 2: Convert to fraction form
    879,691.32/1,213,845 = 492,486.66/x
  3. Step 3: Cross multiply
    879,691.32x = 1,213,845 × 492,486.66
  4. Step 4: Simplify right side
    879,691.32x = 597,802,469,807.70
  5. Step 5: Solve for x
    x = 597,802,469,807.70/879,691.32
  6. Step 6: Final answer
    x = 679,559.36

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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.