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Finding the Fourth Proportional to 102,666.40, 153,740.40 and 81,930.40

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Solution

The fourth proportional to 102,666.40, 153,740.40 and 81,930.40 is: 122,688.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,666.40 : 153,740.40 = 81,930.40 : x
  2. Step 2: Convert to fraction form
    102,666.40/153,740.40 = 81,930.40/x
  3. Step 3: Cross multiply
    102,666.40x = 153,740.40 × 81,930.40
  4. Step 4: Simplify right side
    102,666.40x = 12,596,012,468.16
  5. Step 5: Solve for x
    x = 12,596,012,468.16/102,666.40
  6. Step 6: Final answer
    x = 122,688.75

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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.