Home / 380,985.90-571,478.78-128,245.16

Finding the Fourth Proportional to 380,985.90, 571,478.78 and 128,245.16

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Solution

The fourth proportional to 380,985.90, 571,478.78 and 128,245.16 is: 192,367.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    380,985.90 : 571,478.78 = 128,245.16 : x
  2. Step 2: Convert to fraction form
    380,985.90/571,478.78 = 128,245.16/x
  3. Step 3: Cross multiply
    380,985.90x = 571,478.78 × 128,245.16
  4. Step 4: Simplify right side
    380,985.90x = 73,289,387,577.70
  5. Step 5: Solve for x
    x = 73,289,387,577.70/380,985.90
  6. Step 6: Final answer
    x = 192,367.72

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1.5x scale

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.