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Finding the Fourth Proportional to 28,475.35, 42,712.80 and 7,415.35

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Solution

The fourth proportional to 28,475.35, 42,712.80 and 7,415.35 is: 11,122.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,475.35 : 42,712.80 = 7,415.35 : x
  2. Step 2: Convert to fraction form
    28,475.35/42,712.80 = 7,415.35/x
  3. Step 3: Cross multiply
    28,475.35x = 42,712.80 × 7,415.35
  4. Step 4: Simplify right side
    28,475.35x = 316,730,361.48
  5. Step 5: Solve for x
    x = 316,730,361.48/28,475.35
  6. Step 6: Final answer
    x = 11,122.97

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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.