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Finding the Fourth Proportional to 390,940.38, 586,168.65 and 265,902.30

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Solution

The fourth proportional to 390,940.38, 586,168.65 and 265,902.30 is: 398,688.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,940.38 : 586,168.65 = 265,902.30 : x
  2. Step 2: Convert to fraction form
    390,940.38/586,168.65 = 265,902.30/x
  3. Step 3: Cross multiply
    390,940.38x = 586,168.65 × 265,902.30
  4. Step 4: Simplify right side
    390,940.38x = 155,863,592,222.90
  5. Step 5: Solve for x
    x = 155,863,592,222.90/390,940.38
  6. Step 6: Final answer
    x = 398,688.91

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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.