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Finding the Fourth Proportional to 384,435.40, 576,134.70 and 257,715.40

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Solution

The fourth proportional to 384,435.40, 576,134.70 and 257,715.40 is: 386,225.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    384,435.40 : 576,134.70 = 257,715.40 : x
  2. Step 2: Convert to fraction form
    384,435.40/576,134.70 = 257,715.40/x
  3. Step 3: Cross multiply
    384,435.40x = 576,134.70 × 257,715.40
  4. Step 4: Simplify right side
    384,435.40x = 148,478,784,664.38
  5. Step 5: Solve for x
    x = 148,478,784,664.38/384,435.40
  6. Step 6: Final answer
    x = 386,225.58

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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.