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Finding the Fourth Proportional to 328,178.80, 492,122.40 and 128,432.80

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Solution

The fourth proportional to 328,178.80, 492,122.40 and 128,432.80 is: 192,592.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,178.80 : 492,122.40 = 128,432.80 : x
  2. Step 2: Convert to fraction form
    328,178.80/492,122.40 = 128,432.80/x
  3. Step 3: Cross multiply
    328,178.80x = 492,122.40 × 128,432.80
  4. Step 4: Simplify right side
    328,178.80x = 63,204,657,774.72
  5. Step 5: Solve for x
    x = 63,204,657,774.72/328,178.80
  6. Step 6: Final answer
    x = 192,592.14

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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.