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Finding the Fourth Proportional to 553,820.95, 764,317.87 and 312,119.88

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Solution

The fourth proportional to 553,820.95, 764,317.87 and 312,119.88 is: 430,750.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,820.95 : 764,317.87 = 312,119.88 : x
  2. Step 2: Convert to fraction form
    553,820.95/764,317.87 = 312,119.88/x
  3. Step 3: Cross multiply
    553,820.95x = 764,317.87 × 312,119.88
  4. Step 4: Simplify right side
    553,820.95x = 238,558,804,274.73
  5. Step 5: Solve for x
    x = 238,558,804,274.73/553,820.95
  6. Step 6: Final answer
    x = 430,750.78

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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.