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Finding the Fourth Proportional to 12,486,985.20, 18,725,812.20 and 8,689,186.80

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Solution

The fourth proportional to 12,486,985.20, 18,725,812.20 and 8,689,186.80 is: 13,030,533.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,486,985.20 : 18,725,812.20 = 8,689,186.80 : x
  2. Step 2: Convert to fraction form
    12,486,985.20/18,725,812.20 = 8,689,186.80/x
  3. Step 3: Cross multiply
    12,486,985.20x = 18,725,812.20 × 8,689,186.80
  4. Step 4: Simplify right side
    12,486,985.20x = 162,712,080,187,518.97
  5. Step 5: Solve for x
    x = 162,712,080,187,518.97/12,486,985.20
  6. Step 6: Final answer
    x = 13,030,533.60

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1.5x scale

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.