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Finding the Fourth Proportional to 257,625.60, 386,438.40 and 70,636.80

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Solution

The fourth proportional to 257,625.60, 386,438.40 and 70,636.80 is: 105,955.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,625.60 : 386,438.40 = 70,636.80 : x
  2. Step 2: Convert to fraction form
    257,625.60/386,438.40 = 70,636.80/x
  3. Step 3: Cross multiply
    257,625.60x = 386,438.40 × 70,636.80
  4. Step 4: Simplify right side
    257,625.60x = 27,296,771,973.12
  5. Step 5: Solve for x
    x = 27,296,771,973.12/257,625.60
  6. Step 6: Final answer
    x = 105,955.20

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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.