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Finding the Fourth Proportional to 28,646.40, 42,964.64 and 7,865.04

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Solution

The fourth proportional to 28,646.40, 42,964.64 and 7,865.04 is: 11,796.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,646.40 : 42,964.64 = 7,865.04 : x
  2. Step 2: Convert to fraction form
    28,646.40/42,964.64 = 7,865.04/x
  3. Step 3: Cross multiply
    28,646.40x = 42,964.64 × 7,865.04
  4. Step 4: Simplify right side
    28,646.40x = 337,918,612.19
  5. Step 5: Solve for x
    x = 337,918,612.19/28,646.40
  6. Step 6: Final answer
    x = 11,796.20

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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.