Home / 390,631.31-586,003.10-120,780.50

Finding the Fourth Proportional to 390,631.31, 586,003.10 and 120,780.50

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Solution

The fourth proportional to 390,631.31, 586,003.10 and 120,780.50 is: 181,188.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,631.31 : 586,003.10 = 120,780.50 : x
  2. Step 2: Convert to fraction form
    390,631.31/586,003.10 = 120,780.50/x
  3. Step 3: Cross multiply
    390,631.31x = 586,003.10 × 120,780.50
  4. Step 4: Simplify right side
    390,631.31x = 70,777,747,419.55
  5. Step 5: Solve for x
    x = 70,777,747,419.55/390,631.31
  6. Step 6: Final answer
    x = 181,188.11

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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.