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Finding the Fourth Proportional to 70,103.20, 105,116.40 and 28,503.20

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Solution

The fourth proportional to 70,103.20, 105,116.40 and 28,503.20 is: 42,739.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,103.20 : 105,116.40 = 28,503.20 : x
  2. Step 2: Convert to fraction form
    70,103.20/105,116.40 = 28,503.20/x
  3. Step 3: Cross multiply
    70,103.20x = 105,116.40 × 28,503.20
  4. Step 4: Simplify right side
    70,103.20x = 2,996,153,772.48
  5. Step 5: Solve for x
    x = 2,996,153,772.48/70,103.20
  6. Step 6: Final answer
    x = 42,739.19

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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.