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Finding the Fourth Proportional to 103,708, 142,815.63 and 90,089.79

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Solution

The fourth proportional to 103,708, 142,815.63 and 90,089.79 is: 124,062.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,708 : 142,815.63 = 90,089.79 : x
  2. Step 2: Convert to fraction form
    103,708/142,815.63 = 90,089.79/x
  3. Step 3: Cross multiply
    103,708x = 142,815.63 × 90,089.79
  4. Step 4: Simplify right side
    103,708x = 12,866,230,115.42
  5. Step 5: Solve for x
    x = 12,866,230,115.42/103,708
  6. Step 6: Final answer
    x = 124,062.08

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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.