Home / 28,071.20-38,740.98-20,985.32

Finding the Fourth Proportional to 28,071.20, 38,740.98 and 20,985.32

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Solution

The fourth proportional to 28,071.20, 38,740.98 and 20,985.32 is: 28,961.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,071.20 : 38,740.98 = 20,985.32 : x
  2. Step 2: Convert to fraction form
    28,071.20/38,740.98 = 20,985.32/x
  3. Step 3: Cross multiply
    28,071.20x = 38,740.98 × 20,985.32
  4. Step 4: Simplify right side
    28,071.20x = 812,991,862.41
  5. Step 5: Solve for x
    x = 812,991,862.41/28,071.20
  6. Step 6: Final answer
    x = 28,961.78

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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.