Home / 20,881.20-31,386.60-20,492.40

Finding the Fourth Proportional to 20,881.20, 31,386.60 and 20,492.40

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Solution

The fourth proportional to 20,881.20, 31,386.60 and 20,492.40 is: 30,802.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,881.20 : 31,386.60 = 20,492.40 : x
  2. Step 2: Convert to fraction form
    20,881.20/31,386.60 = 20,492.40/x
  3. Step 3: Cross multiply
    20,881.20x = 31,386.60 × 20,492.40
  4. Step 4: Simplify right side
    20,881.20x = 643,186,761.84
  5. Step 5: Solve for x
    x = 643,186,761.84/20,881.20
  6. Step 6: Final answer
    x = 30,802.19

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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.