Home / 43,178.78-64,751.16-20,985.60

Finding the Fourth Proportional to 43,178.78, 64,751.16 and 20,985.60

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Solution

The fourth proportional to 43,178.78, 64,751.16 and 20,985.60 is: 31,470.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,178.78 : 64,751.16 = 20,985.60 : x
  2. Step 2: Convert to fraction form
    43,178.78/64,751.16 = 20,985.60/x
  3. Step 3: Cross multiply
    43,178.78x = 64,751.16 × 20,985.60
  4. Step 4: Simplify right side
    43,178.78x = 1,358,841,943.30
  5. Step 5: Solve for x
    x = 1,358,841,943.30/43,178.78
  6. Step 6: Final answer
    x = 31,470.13

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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.