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Finding the Fourth Proportional to 397,985.80, 596,978.70 and 131,787.40

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Solution

The fourth proportional to 397,985.80, 596,978.70 and 131,787.40 is: 197,681.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    397,985.80 : 596,978.70 = 131,787.40 : x
  2. Step 2: Convert to fraction form
    397,985.80/596,978.70 = 131,787.40/x
  3. Step 3: Cross multiply
    397,985.80x = 596,978.70 × 131,787.40
  4. Step 4: Simplify right side
    397,985.80x = 78,674,270,728.38
  5. Step 5: Solve for x
    x = 78,674,270,728.38/397,985.80
  6. Step 6: Final answer
    x = 197,681.10

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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.