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Finding the Fourth Proportional to 99,710.80, 149,639.10 and 66,419.80

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Solution

The fourth proportional to 99,710.80, 149,639.10 and 66,419.80 is: 99,678.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,710.80 : 149,639.10 = 66,419.80 : x
  2. Step 2: Convert to fraction form
    99,710.80/149,639.10 = 66,419.80/x
  3. Step 3: Cross multiply
    99,710.80x = 149,639.10 × 66,419.80
  4. Step 4: Simplify right side
    99,710.80x = 9,938,999,094.18
  5. Step 5: Solve for x
    x = 9,938,999,094.18/99,710.80
  6. Step 6: Final answer
    x = 99,678.26

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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.