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Finding the Fourth Proportional to 66,649.60, 99,985.60 and 19,907.20

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Solution

The fourth proportional to 66,649.60, 99,985.60 and 19,907.20 is: 29,864.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,649.60 : 99,985.60 = 19,907.20 : x
  2. Step 2: Convert to fraction form
    66,649.60/99,985.60 = 19,907.20/x
  3. Step 3: Cross multiply
    66,649.60x = 99,985.60 × 19,907.20
  4. Step 4: Simplify right side
    66,649.60x = 1,990,433,336.32
  5. Step 5: Solve for x
    x = 1,990,433,336.32/66,649.60
  6. Step 6: Final answer
    x = 29,864.15

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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.