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Finding the Fourth Proportional to 328,278.60, 492,072.30 and 128,521.80

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Solution

The fourth proportional to 328,278.60, 492,072.30 and 128,521.80 is: 192,647.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,278.60 : 492,072.30 = 128,521.80 : x
  2. Step 2: Convert to fraction form
    328,278.60/492,072.30 = 128,521.80/x
  3. Step 3: Cross multiply
    328,278.60x = 492,072.30 × 128,521.80
  4. Step 4: Simplify right side
    328,278.60x = 63,242,017,726.14
  5. Step 5: Solve for x
    x = 63,242,017,726.14/328,278.60
  6. Step 6: Final answer
    x = 192,647.40

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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.