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Finding the Fourth Proportional to 7,210,978.68, 9,951,152.80 and 3,948,000.64

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Solution

The fourth proportional to 7,210,978.68, 9,951,152.80 and 3,948,000.64 is: 5,448,242.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,210,978.68 : 9,951,152.80 = 3,948,000.64 : x
  2. Step 2: Convert to fraction form
    7,210,978.68/9,951,152.80 = 3,948,000.64/x
  3. Step 3: Cross multiply
    7,210,978.68x = 9,951,152.80 × 3,948,000.64
  4. Step 4: Simplify right side
    7,210,978.68x = 39,287,157,623,137.80
  5. Step 5: Solve for x
    x = 39,287,157,623,137.80/7,210,978.68
  6. Step 6: Final answer
    x = 5,448,242.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.