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Finding the Fourth Proportional to 19,700.79, 27,178.52 and 12,977.79

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Solution

The fourth proportional to 19,700.79, 27,178.52 and 12,977.79 is: 17,903.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,700.79 : 27,178.52 = 12,977.79 : x
  2. Step 2: Convert to fraction form
    19,700.79/27,178.52 = 12,977.79/x
  3. Step 3: Cross multiply
    19,700.79x = 27,178.52 × 12,977.79
  4. Step 4: Simplify right side
    19,700.79x = 352,717,060.18
  5. Step 5: Solve for x
    x = 352,717,060.18/19,700.79
  6. Step 6: Final answer
    x = 17,903.70

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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.