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Finding the Fourth Proportional to 12,700.80, 19,051.20 and 9,420.30

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Solution

The fourth proportional to 12,700.80, 19,051.20 and 9,420.30 is: 14,130.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,700.80 : 19,051.20 = 9,420.30 : x
  2. Step 2: Convert to fraction form
    12,700.80/19,051.20 = 9,420.30/x
  3. Step 3: Cross multiply
    12,700.80x = 19,051.20 × 9,420.30
  4. Step 4: Simplify right side
    12,700.80x = 179,468,019.36
  5. Step 5: Solve for x
    x = 179,468,019.36/12,700.80
  6. Step 6: Final answer
    x = 14,130.45

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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.