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Finding the Fourth Proportional to 260,012.80, 390,019.20 and 126,978.40

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Solution

The fourth proportional to 260,012.80, 390,019.20 and 126,978.40 is: 190,467.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,012.80 : 390,019.20 = 126,978.40 : x
  2. Step 2: Convert to fraction form
    260,012.80/390,019.20 = 126,978.40/x
  3. Step 3: Cross multiply
    260,012.80x = 390,019.20 × 126,978.40
  4. Step 4: Simplify right side
    260,012.80x = 49,524,013,985.28
  5. Step 5: Solve for x
    x = 49,524,013,985.28/260,012.80
  6. Step 6: Final answer
    x = 190,467.60

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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.