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Finding the Fourth Proportional to 72,615.20, 100,205.88 and 42,402.20

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Solution

The fourth proportional to 72,615.20, 100,205.88 and 42,402.20 is: 58,513.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,615.20 : 100,205.88 = 42,402.20 : x
  2. Step 2: Convert to fraction form
    72,615.20/100,205.88 = 42,402.20/x
  3. Step 3: Cross multiply
    72,615.20x = 100,205.88 × 42,402.20
  4. Step 4: Simplify right side
    72,615.20x = 4,248,949,764.94
  5. Step 5: Solve for x
    x = 4,248,949,764.94/72,615.20
  6. Step 6: Final answer
    x = 58,513.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.