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Finding the Fourth Proportional to 278,421.40, 417,632.10 and 100,928.20

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Solution

The fourth proportional to 278,421.40, 417,632.10 and 100,928.20 is: 151,392.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,421.40 : 417,632.10 = 100,928.20 : x
  2. Step 2: Convert to fraction form
    278,421.40/417,632.10 = 100,928.20/x
  3. Step 3: Cross multiply
    278,421.40x = 417,632.10 × 100,928.20
  4. Step 4: Simplify right side
    278,421.40x = 42,150,856,115.22
  5. Step 5: Solve for x
    x = 42,150,856,115.22/278,421.40
  6. Step 6: Final answer
    x = 151,392.30

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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.