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Finding the Fourth Proportional to 13,458,661.20, 20,187,991.80 and 9,844,862.40

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Solution

The fourth proportional to 13,458,661.20, 20,187,991.80 and 9,844,862.40 is: 14,767,293.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,458,661.20 : 20,187,991.80 = 9,844,862.40 : x
  2. Step 2: Convert to fraction form
    13,458,661.20/20,187,991.80 = 9,844,862.40/x
  3. Step 3: Cross multiply
    13,458,661.20x = 20,187,991.80 × 9,844,862.40
  4. Step 4: Simplify right side
    13,458,661.20x = 198,748,001,403,328.34
  5. Step 5: Solve for x
    x = 198,748,001,403,328.34/13,458,661.20
  6. Step 6: Final answer
    x = 14,767,293.60

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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.