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Finding the Fourth Proportional to 101,390.90, 139,913.78 and 56,066.13

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Solution

The fourth proportional to 101,390.90, 139,913.78 and 56,066.13 is: 77,368.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,390.90 : 139,913.78 = 56,066.13 : x
  2. Step 2: Convert to fraction form
    101,390.90/139,913.78 = 56,066.13/x
  3. Step 3: Cross multiply
    101,390.90x = 139,913.78 × 56,066.13
  4. Step 4: Simplify right side
    101,390.90x = 7,844,423,897.94
  5. Step 5: Solve for x
    x = 7,844,423,897.94/101,390.90
  6. Step 6: Final answer
    x = 77,368.13

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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.