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Finding the Fourth Proportional to 105,117.60, 157,676.40 and 86,455.20

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Solution

The fourth proportional to 105,117.60, 157,676.40 and 86,455.20 is: 129,682.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,117.60 : 157,676.40 = 86,455.20 : x
  2. Step 2: Convert to fraction form
    105,117.60/157,676.40 = 86,455.20/x
  3. Step 3: Cross multiply
    105,117.60x = 157,676.40 × 86,455.20
  4. Step 4: Simplify right side
    105,117.60x = 13,631,944,697.28
  5. Step 5: Solve for x
    x = 13,631,944,697.28/105,117.60
  6. Step 6: Final answer
    x = 129,682.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.