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Finding the Fourth Proportional to 109,985.20, 164,686.20 and 86,657.20

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Solution

The fourth proportional to 109,985.20, 164,686.20 and 86,657.20 is: 129,756.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,985.20 : 164,686.20 = 86,657.20 : x
  2. Step 2: Convert to fraction form
    109,985.20/164,686.20 = 86,657.20/x
  3. Step 3: Cross multiply
    109,985.20x = 164,686.20 × 86,657.20
  4. Step 4: Simplify right side
    109,985.20x = 14,271,244,970.64
  5. Step 5: Solve for x
    x = 14,271,244,970.64/109,985.20
  6. Step 6: Final answer
    x = 129,756.05

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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.