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Finding the Fourth Proportional to 636,985.40, 955,478.10 and 257,905.40

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Solution

The fourth proportional to 636,985.40, 955,478.10 and 257,905.40 is: 386,858.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,985.40 : 955,478.10 = 257,905.40 : x
  2. Step 2: Convert to fraction form
    636,985.40/955,478.10 = 257,905.40/x
  3. Step 3: Cross multiply
    636,985.40x = 955,478.10 × 257,905.40
  4. Step 4: Simplify right side
    636,985.40x = 246,422,961,571.74
  5. Step 5: Solve for x
    x = 246,422,961,571.74/636,985.40
  6. Step 6: Final answer
    x = 386,858.10

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.