Home / 20,528.60-30,802.10-12,643.07

Finding the Fourth Proportional to 20,528.60, 30,802.10 and 12,643.07

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Solution

The fourth proportional to 20,528.60, 30,802.10 and 12,643.07 is: 18,970.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,528.60 : 30,802.10 = 12,643.07 : x
  2. Step 2: Convert to fraction form
    20,528.60/30,802.10 = 12,643.07/x
  3. Step 3: Cross multiply
    20,528.60x = 30,802.10 × 12,643.07
  4. Step 4: Simplify right side
    20,528.60x = 389,432,889.22
  5. Step 5: Solve for x
    x = 389,432,889.22/20,528.60
  6. Step 6: Final answer
    x = 18,970.27

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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.