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Finding the Fourth Proportional to 260,020.80, 390,031.20 and 126,986.40

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Solution

The fourth proportional to 260,020.80, 390,031.20 and 126,986.40 is: 190,479.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,020.80 : 390,031.20 = 126,986.40 : x
  2. Step 2: Convert to fraction form
    260,020.80/390,031.20 = 126,986.40/x
  3. Step 3: Cross multiply
    260,020.80x = 390,031.20 × 126,986.40
  4. Step 4: Simplify right side
    260,020.80x = 49,528,657,975.68
  5. Step 5: Solve for x
    x = 49,528,657,975.68/260,020.80
  6. Step 6: Final answer
    x = 190,479.60

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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.