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Finding the Fourth Proportional to 66,315.20, 99,490.40 and 28,859.20

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Solution

The fourth proportional to 66,315.20, 99,490.40 and 28,859.20 is: 43,296.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,315.20 : 99,490.40 = 28,859.20 : x
  2. Step 2: Convert to fraction form
    66,315.20/99,490.40 = 28,859.20/x
  3. Step 3: Cross multiply
    66,315.20x = 99,490.40 × 28,859.20
  4. Step 4: Simplify right side
    66,315.20x = 2,871,213,351.68
  5. Step 5: Solve for x
    x = 2,871,213,351.68/66,315.20
  6. Step 6: Final answer
    x = 43,296.46

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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.