Home / 12,985.60-19,478.40-8,039.20

Finding the Fourth Proportional to 12,985.60, 19,478.40 and 8,039.20

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Solution

The fourth proportional to 12,985.60, 19,478.40 and 8,039.20 is: 12,058.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,985.60 : 19,478.40 = 8,039.20 : x
  2. Step 2: Convert to fraction form
    12,985.60/19,478.40 = 8,039.20/x
  3. Step 3: Cross multiply
    12,985.60x = 19,478.40 × 8,039.20
  4. Step 4: Simplify right side
    12,985.60x = 156,590,753.28
  5. Step 5: Solve for x
    x = 156,590,753.28/12,985.60
  6. Step 6: Final answer
    x = 12,058.80

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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.