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Finding the Fourth Proportional to 31,661.81, 47,509.07 and 13,904.93

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Solution

The fourth proportional to 31,661.81, 47,509.07 and 13,904.93 is: 20,864.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,661.81 : 47,509.07 = 13,904.93 : x
  2. Step 2: Convert to fraction form
    31,661.81/47,509.07 = 13,904.93/x
  3. Step 3: Cross multiply
    31,661.81x = 47,509.07 × 13,904.93
  4. Step 4: Simplify right side
    31,661.81x = 660,609,985.65
  5. Step 5: Solve for x
    x = 660,609,985.65/31,661.81
  6. Step 6: Final answer
    x = 20,864.57

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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.