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Finding the Fourth Proportional to 665,672.40, 997,925.40 and 399,538.80

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Solution

The fourth proportional to 665,672.40, 997,925.40 and 399,538.80 is: 598,958.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,672.40 : 997,925.40 = 399,538.80 : x
  2. Step 2: Convert to fraction form
    665,672.40/997,925.40 = 399,538.80/x
  3. Step 3: Cross multiply
    665,672.40x = 997,925.40 × 399,538.80
  4. Step 4: Simplify right side
    665,672.40x = 398,709,916,805.52
  5. Step 5: Solve for x
    x = 398,709,916,805.52/665,672.40
  6. Step 6: Final answer
    x = 598,958.16

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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.