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Finding the Fourth Proportional to 102,656.80, 153,985.20 and 85,376.80

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Solution

The fourth proportional to 102,656.80, 153,985.20 and 85,376.80 is: 128,065.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,656.80 : 153,985.20 = 85,376.80 : x
  2. Step 2: Convert to fraction form
    102,656.80/153,985.20 = 85,376.80/x
  3. Step 3: Cross multiply
    102,656.80x = 153,985.20 × 85,376.80
  4. Step 4: Simplify right side
    102,656.80x = 13,146,763,623.36
  5. Step 5: Solve for x
    x = 13,146,763,623.36/102,656.80
  6. Step 6: Final answer
    x = 128,065.20

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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.