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Finding the Fourth Proportional to 3,985,655.20, 5,978,482.80 and 3,948,330.40

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Solution

The fourth proportional to 3,985,655.20, 5,978,482.80 and 3,948,330.40 is: 5,922,495.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,985,655.20 : 5,978,482.80 = 3,948,330.40 : x
  2. Step 2: Convert to fraction form
    3,985,655.20/5,978,482.80 = 3,948,330.40/x
  3. Step 3: Cross multiply
    3,985,655.20x = 5,978,482.80 × 3,948,330.40
  4. Step 4: Simplify right side
    3,985,655.20x = 23,605,025,385,117.12
  5. Step 5: Solve for x
    x = 23,605,025,385,117.12/3,985,655.20
  6. Step 6: Final answer
    x = 5,922,495.60

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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.