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Finding the Fourth Proportional to 78,881.90, 108,856.59 and 43,071.66

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Solution

The fourth proportional to 78,881.90, 108,856.59 and 43,071.66 is: 59,438.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,881.90 : 108,856.59 = 43,071.66 : x
  2. Step 2: Convert to fraction form
    78,881.90/108,856.59 = 43,071.66/x
  3. Step 3: Cross multiply
    78,881.90x = 108,856.59 × 43,071.66
  4. Step 4: Simplify right side
    78,881.90x = 4,688,634,337.19
  5. Step 5: Solve for x
    x = 4,688,634,337.19/78,881.90
  6. Step 6: Final answer
    x = 59,438.66

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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.