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Finding the Fourth Proportional to 19,703.79, 27,182.65 and 12,980.79

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Solution

The fourth proportional to 19,703.79, 27,182.65 and 12,980.79 is: 17,907.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,703.79 : 27,182.65 = 12,980.79 : x
  2. Step 2: Convert to fraction form
    19,703.79/27,182.65 = 12,980.79/x
  3. Step 3: Cross multiply
    19,703.79x = 27,182.65 × 12,980.79
  4. Step 4: Simplify right side
    19,703.79x = 352,852,271.29
  5. Step 5: Solve for x
    x = 352,852,271.29/19,703.79
  6. Step 6: Final answer
    x = 17,907.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.