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Finding the Fourth Proportional to 328,564.80, 492,482.70 and 128,818.80

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Solution

The fourth proportional to 328,564.80, 492,482.70 and 128,818.80 is: 193,085.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,564.80 : 492,482.70 = 128,818.80 : x
  2. Step 2: Convert to fraction form
    328,564.80/492,482.70 = 128,818.80/x
  3. Step 3: Cross multiply
    328,564.80x = 492,482.70 × 128,818.80
  4. Step 4: Simplify right side
    328,564.80x = 63,441,030,434.76
  5. Step 5: Solve for x
    x = 63,441,030,434.76/328,564.80
  6. Step 6: Final answer
    x = 193,085.29

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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.