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Finding the Fourth Proportional to 72,907.40, 109,490.70 and 53,208.20

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Solution

The fourth proportional to 72,907.40, 109,490.70 and 53,208.20 is: 79,906.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,907.40 : 109,490.70 = 53,208.20 : x
  2. Step 2: Convert to fraction form
    72,907.40/109,490.70 = 53,208.20/x
  3. Step 3: Cross multiply
    72,907.40x = 109,490.70 × 53,208.20
  4. Step 4: Simplify right side
    72,907.40x = 5,825,803,063.74
  5. Step 5: Solve for x
    x = 5,825,803,063.74/72,907.40
  6. Step 6: Final answer
    x = 79,906.88

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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.