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Finding the Fourth Proportional to 328,693.19, 492,817.30 and 128,888.87

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Solution

The fourth proportional to 328,693.19, 492,817.30 and 128,888.87 is: 193,246.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,693.19 : 492,817.30 = 128,888.87 : x
  2. Step 2: Convert to fraction form
    328,693.19/492,817.30 = 128,888.87/x
  3. Step 3: Cross multiply
    328,693.19x = 492,817.30 × 128,888.87
  4. Step 4: Simplify right side
    328,693.19x = 63,518,662,127.14
  5. Step 5: Solve for x
    x = 63,518,662,127.14/328,693.19
  6. Step 6: Final answer
    x = 193,246.06

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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.