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Finding the Fourth Proportional to 70,411.70, 105,655.95 and 28,862.90

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Solution

The fourth proportional to 70,411.70, 105,655.95 and 28,862.90 is: 43,310.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,411.70 : 105,655.95 = 28,862.90 : x
  2. Step 2: Convert to fraction form
    70,411.70/105,655.95 = 28,862.90/x
  3. Step 3: Cross multiply
    70,411.70x = 105,655.95 × 28,862.90
  4. Step 4: Simplify right side
    70,411.70x = 3,049,537,119.26
  5. Step 5: Solve for x
    x = 3,049,537,119.26/70,411.70
  6. Step 6: Final answer
    x = 43,310.09

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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.