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Finding the Fourth Proportional to 15,779.80, 21,831.42 and 15,434.20

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Solution

The fourth proportional to 15,779.80, 21,831.42 and 15,434.20 is: 21,353.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,779.80 : 21,831.42 = 15,434.20 : x
  2. Step 2: Convert to fraction form
    15,779.80/21,831.42 = 15,434.20/x
  3. Step 3: Cross multiply
    15,779.80x = 21,831.42 × 15,434.20
  4. Step 4: Simplify right side
    15,779.80x = 336,950,502.56
  5. Step 5: Solve for x
    x = 336,950,502.56/15,779.80
  6. Step 6: Final answer
    x = 21,353.28

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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.