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Finding the Fourth Proportional to 257,619.60, 386,429.40 and 70,630.80

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Solution

The fourth proportional to 257,619.60, 386,429.40 and 70,630.80 is: 105,946.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,619.60 : 386,429.40 = 70,630.80 : x
  2. Step 2: Convert to fraction form
    257,619.60/386,429.40 = 70,630.80/x
  3. Step 3: Cross multiply
    257,619.60x = 386,429.40 × 70,630.80
  4. Step 4: Simplify right side
    257,619.60x = 27,293,817,665.52
  5. Step 5: Solve for x
    x = 27,293,817,665.52/257,619.60
  6. Step 6: Final answer
    x = 105,946.20

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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.