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Finding the Fourth Proportional to 72,607.20, 108,889.20 and 28,208.40

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Solution

The fourth proportional to 72,607.20, 108,889.20 and 28,208.40 is: 42,304.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,607.20 : 108,889.20 = 28,208.40 : x
  2. Step 2: Convert to fraction form
    72,607.20/108,889.20 = 28,208.40/x
  3. Step 3: Cross multiply
    72,607.20x = 108,889.20 × 28,208.40
  4. Step 4: Simplify right side
    72,607.20x = 3,071,590,109.28
  5. Step 5: Solve for x
    x = 3,071,590,109.28/72,607.20
  6. Step 6: Final answer
    x = 42,304.21

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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.