Home / 12,985.20-19,420.20-10,911.60

Finding the Fourth Proportional to 12,985.20, 19,420.20 and 10,911.60

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Solution

The fourth proportional to 12,985.20, 19,420.20 and 10,911.60 is: 16,319.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,985.20 : 19,420.20 = 10,911.60 : x
  2. Step 2: Convert to fraction form
    12,985.20/19,420.20 = 10,911.60/x
  3. Step 3: Cross multiply
    12,985.20x = 19,420.20 × 10,911.60
  4. Step 4: Simplify right side
    12,985.20x = 211,905,454.32
  5. Step 5: Solve for x
    x = 211,905,454.32/12,985.20
  6. Step 6: Final answer
    x = 16,319.00

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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.