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Finding the Fourth Proportional to 13,116,981.16, 18,101,431.92 and 7,315,638.45

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Solution

The fourth proportional to 13,116,981.16, 18,101,431.92 and 7,315,638.45 is: 10,095,579.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,116,981.16 : 18,101,431.92 = 7,315,638.45 : x
  2. Step 2: Convert to fraction form
    13,116,981.16/18,101,431.92 = 7,315,638.45/x
  3. Step 3: Cross multiply
    13,116,981.16x = 18,101,431.92 × 7,315,638.45
  4. Step 4: Simplify right side
    13,116,981.16x = 132,423,531,354,009.34
  5. Step 5: Solve for x
    x = 132,423,531,354,009.34/13,116,981.16
  6. Step 6: Final answer
    x = 10,095,579.90

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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.