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Finding the Fourth Proportional to 103,690.90, 155,536.35 and 70,513.30

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Solution

The fourth proportional to 103,690.90, 155,536.35 and 70,513.30 is: 105,769.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,690.90 : 155,536.35 = 70,513.30 : x
  2. Step 2: Convert to fraction form
    103,690.90/155,536.35 = 70,513.30/x
  3. Step 3: Cross multiply
    103,690.90x = 155,536.35 × 70,513.30
  4. Step 4: Simplify right side
    103,690.90x = 10,967,381,308.46
  5. Step 5: Solve for x
    x = 10,967,381,308.46/103,690.90
  6. Step 6: Final answer
    x = 105,769.95

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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.