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Finding the Fourth Proportional to 553,978.49, 764,479.53 and 312,256.49

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Solution

The fourth proportional to 553,978.49, 764,479.53 and 312,256.49 is: 430,907.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,978.49 : 764,479.53 = 312,256.49 : x
  2. Step 2: Convert to fraction form
    553,978.49/764,479.53 = 312,256.49/x
  3. Step 3: Cross multiply
    553,978.49x = 764,479.53 × 312,256.49
  4. Step 4: Simplify right side
    553,978.49x = 238,713,690,892.25
  5. Step 5: Solve for x
    x = 238,713,690,892.25/553,978.49
  6. Step 6: Final answer
    x = 430,907.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.