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Finding the Fourth Proportional to 338,463.40, 507,695.10 and 85,743.40

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Solution

The fourth proportional to 338,463.40, 507,695.10 and 85,743.40 is: 128,615.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,463.40 : 507,695.10 = 85,743.40 : x
  2. Step 2: Convert to fraction form
    338,463.40/507,695.10 = 85,743.40/x
  3. Step 3: Cross multiply
    338,463.40x = 507,695.10 × 85,743.40
  4. Step 4: Simplify right side
    338,463.40x = 43,531,504,037.34
  5. Step 5: Solve for x
    x = 43,531,504,037.34/338,463.40
  6. Step 6: Final answer
    x = 128,615.10

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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.