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Finding the Fourth Proportional to 103,666.60, 155,499.90 and 68,031.40

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Solution

The fourth proportional to 103,666.60, 155,499.90 and 68,031.40 is: 102,047.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,666.60 : 155,499.90 = 68,031.40 : x
  2. Step 2: Convert to fraction form
    103,666.60/155,499.90 = 68,031.40/x
  3. Step 3: Cross multiply
    103,666.60x = 155,499.90 × 68,031.40
  4. Step 4: Simplify right side
    103,666.60x = 10,578,875,896.86
  5. Step 5: Solve for x
    x = 10,578,875,896.86/103,666.60
  6. Step 6: Final answer
    x = 102,047.10

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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.