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Finding the Fourth Proportional to 657,643.20, 986,464.80 and 338,778.60

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Solution

The fourth proportional to 657,643.20, 986,464.80 and 338,778.60 is: 508,167.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,643.20 : 986,464.80 = 338,778.60 : x
  2. Step 2: Convert to fraction form
    657,643.20/986,464.80 = 338,778.60/x
  3. Step 3: Cross multiply
    657,643.20x = 986,464.80 × 338,778.60
  4. Step 4: Simplify right side
    657,643.20x = 334,193,163,893.28
  5. Step 5: Solve for x
    x = 334,193,163,893.28/657,643.20
  6. Step 6: Final answer
    x = 508,167.90

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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.