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Finding the Fourth Proportional to 104,987.43, 145,020.95 and 77,818.59

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Solution

The fourth proportional to 104,987.43, 145,020.95 and 77,818.59 is: 107,492.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,987.43 : 145,020.95 = 77,818.59 : x
  2. Step 2: Convert to fraction form
    104,987.43/145,020.95 = 77,818.59/x
  3. Step 3: Cross multiply
    104,987.43x = 145,020.95 × 77,818.59
  4. Step 4: Simplify right side
    104,987.43x = 11,285,325,849.46
  5. Step 5: Solve for x
    x = 11,285,325,849.46/104,987.43
  6. Step 6: Final answer
    x = 107,492.16

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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.