Home / 667,985.12-921,800.40-381,499.28

Finding the Fourth Proportional to 667,985.12, 921,800.40 and 381,499.28

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Solution

The fourth proportional to 667,985.12, 921,800.40 and 381,499.28 is: 526,458.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,985.12 : 921,800.40 = 381,499.28 : x
  2. Step 2: Convert to fraction form
    667,985.12/921,800.40 = 381,499.28/x
  3. Step 3: Cross multiply
    667,985.12x = 921,800.40 × 381,499.28
  4. Step 4: Simplify right side
    667,985.12x = 351,666,188,903.71
  5. Step 5: Solve for x
    x = 351,666,188,903.71/667,985.12
  6. Step 6: Final answer
    x = 526,458.12

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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.