Home / 155,405.67-214,439.64-87,420.35

Finding the Fourth Proportional to 155,405.67, 214,439.64 and 87,420.35

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Solution

The fourth proportional to 155,405.67, 214,439.64 and 87,420.35 is: 120,628.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,405.67 : 214,439.64 = 87,420.35 : x
  2. Step 2: Convert to fraction form
    155,405.67/214,439.64 = 87,420.35/x
  3. Step 3: Cross multiply
    155,405.67x = 214,439.64 × 87,420.35
  4. Step 4: Simplify right side
    155,405.67x = 18,746,387,310.48
  5. Step 5: Solve for x
    x = 18,746,387,310.48/155,405.67
  6. Step 6: Final answer
    x = 120,628.72

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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.