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Finding the Fourth Proportional to 103,712, 143,122.56 and 56,608

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Solution

The fourth proportional to 103,712, 143,122.56 and 56,608 is: 78,119.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,712 : 143,122.56 = 56,608 : x
  2. Step 2: Convert to fraction form
    103,712/143,122.56 = 56,608/x
  3. Step 3: Cross multiply
    103,712x = 143,122.56 × 56,608
  4. Step 4: Simplify right side
    103,712x = 8,101,881,876.48
  5. Step 5: Solve for x
    x = 8,101,881,876.48/103,712
  6. Step 6: Final answer
    x = 78,119.04

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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.