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Finding the Fourth Proportional to 8,776,978.90, 12,113,142.58 and 5,055,938.51

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Solution

The fourth proportional to 8,776,978.90, 12,113,142.58 and 5,055,938.51 is: 6,977,720.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,776,978.90 : 12,113,142.58 = 5,055,938.51 : x
  2. Step 2: Convert to fraction form
    8,776,978.90/12,113,142.58 = 5,055,938.51/x
  3. Step 3: Cross multiply
    8,776,978.90x = 12,113,142.58 × 5,055,938.51
  4. Step 4: Simplify right side
    8,776,978.90x = 61,243,304,017,239.12
  5. Step 5: Solve for x
    x = 61,243,304,017,239.12/8,776,978.90
  6. Step 6: Final answer
    x = 6,977,720.32

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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.