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Finding the Fourth Proportional to 738,395, 1,018,985.64 and 398,863.25

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Solution

The fourth proportional to 738,395, 1,018,985.64 and 398,863.25 is: 550,431.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    738,395 : 1,018,985.64 = 398,863.25 : x
  2. Step 2: Convert to fraction form
    738,395/1,018,985.64 = 398,863.25/x
  3. Step 3: Cross multiply
    738,395x = 1,018,985.64 × 398,863.25
  4. Step 4: Simplify right side
    738,395x = 406,435,924,073.73
  5. Step 5: Solve for x
    x = 406,435,924,073.73/738,395
  6. Step 6: Final answer
    x = 550,431.58

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Double scale
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Similar ratio
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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.