Home / 21,017.52-31,470.66-12,686.40

Finding the Fourth Proportional to 21,017.52, 31,470.66 and 12,686.40

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Solution

The fourth proportional to 21,017.52, 31,470.66 and 12,686.40 is: 18,996.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,017.52 : 31,470.66 = 12,686.40 : x
  2. Step 2: Convert to fraction form
    21,017.52/31,470.66 = 12,686.40/x
  3. Step 3: Cross multiply
    21,017.52x = 31,470.66 × 12,686.40
  4. Step 4: Simplify right side
    21,017.52x = 399,249,381.02
  5. Step 5: Solve for x
    x = 399,249,381.02/21,017.52
  6. Step 6: Final answer
    x = 18,996.03

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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.