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Finding the Fourth Proportional to 260,630.40, 390,868.80 and 102,806.40

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Solution

The fourth proportional to 260,630.40, 390,868.80 and 102,806.40 is: 154,179.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,630.40 : 390,868.80 = 102,806.40 : x
  2. Step 2: Convert to fraction form
    260,630.40/390,868.80 = 102,806.40/x
  3. Step 3: Cross multiply
    260,630.40x = 390,868.80 × 102,806.40
  4. Step 4: Simplify right side
    260,630.40x = 40,183,814,200.32
  5. Step 5: Solve for x
    x = 40,183,814,200.32/260,630.40
  6. Step 6: Final answer
    x = 154,179.31

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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.