Home / 20,430.96-28,186.56-12,875.28

Finding the Fourth Proportional to 20,430.96, 28,186.56 and 12,875.28

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Solution

The fourth proportional to 20,430.96, 28,186.56 and 12,875.28 is: 17,762.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.96 : 28,186.56 = 12,875.28 : x
  2. Step 2: Convert to fraction form
    20,430.96/28,186.56 = 12,875.28/x
  3. Step 3: Cross multiply
    20,430.96x = 28,186.56 × 12,875.28
  4. Step 4: Simplify right side
    20,430.96x = 362,909,852.24
  5. Step 5: Solve for x
    x = 362,909,852.24/20,430.96
  6. Step 6: Final answer
    x = 17,762.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.