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Finding the Fourth Proportional to 19,239.60, 28,859.40 and 18,980.40

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Solution

The fourth proportional to 19,239.60, 28,859.40 and 18,980.40 is: 28,470.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,239.60 : 28,859.40 = 18,980.40 : x
  2. Step 2: Convert to fraction form
    19,239.60/28,859.40 = 18,980.40/x
  3. Step 3: Cross multiply
    19,239.60x = 28,859.40 × 18,980.40
  4. Step 4: Simplify right side
    19,239.60x = 547,762,955.76
  5. Step 5: Solve for x
    x = 547,762,955.76/19,239.60
  6. Step 6: Final answer
    x = 28,470.60

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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.