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Finding the Fourth Proportional to 328,533.40, 492,702.90 and 128,738.80

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Solution

The fourth proportional to 328,533.40, 492,702.90 and 128,738.80 is: 193,070.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,533.40 : 492,702.90 = 128,738.80 : x
  2. Step 2: Convert to fraction form
    328,533.40/492,702.90 = 128,738.80/x
  3. Step 3: Cross multiply
    328,533.40x = 492,702.90 × 128,738.80
  4. Step 4: Simplify right side
    328,533.40x = 63,429,980,102.52
  5. Step 5: Solve for x
    x = 63,429,980,102.52/328,533.40
  6. Step 6: Final answer
    x = 193,070.11

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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.