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Finding the Fourth Proportional to 78,170.85, 107,875.44 and 42,360.89

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Solution

The fourth proportional to 78,170.85, 107,875.44 and 42,360.89 is: 58,457.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,170.85 : 107,875.44 = 42,360.89 : x
  2. Step 2: Convert to fraction form
    78,170.85/107,875.44 = 42,360.89/x
  3. Step 3: Cross multiply
    78,170.85x = 107,875.44 × 42,360.89
  4. Step 4: Simplify right side
    78,170.85x = 4,569,699,108.16
  5. Step 5: Solve for x
    x = 4,569,699,108.16/78,170.85
  6. Step 6: Final answer
    x = 58,457.84

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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.