Home / 20,987.12-31,508.76-13,470.32

Finding the Fourth Proportional to 20,987.12, 31,508.76 and 13,470.32

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Solution

The fourth proportional to 20,987.12, 31,508.76 and 13,470.32 is: 20,223.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.12 : 31,508.76 = 13,470.32 : x
  2. Step 2: Convert to fraction form
    20,987.12/31,508.76 = 13,470.32/x
  3. Step 3: Cross multiply
    20,987.12x = 31,508.76 × 13,470.32
  4. Step 4: Simplify right side
    20,987.12x = 424,433,080.00
  5. Step 5: Solve for x
    x = 424,433,080.00/20,987.12
  6. Step 6: Final answer
    x = 20,223.50

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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.