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Finding the Fourth Proportional to 103,689.40, 143,053.95 and 67,899.82

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Solution

The fourth proportional to 103,689.40, 143,053.95 and 67,899.82 is: 93,677.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,689.40 : 143,053.95 = 67,899.82 : x
  2. Step 2: Convert to fraction form
    103,689.40/143,053.95 = 67,899.82/x
  3. Step 3: Cross multiply
    103,689.40x = 143,053.95 × 67,899.82
  4. Step 4: Simplify right side
    103,689.40x = 9,713,337,455.29
  5. Step 5: Solve for x
    x = 9,713,337,455.29/103,689.40
  6. Step 6: Final answer
    x = 93,677.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.