Home / 28,670.50-39,518.91-21,390.22

Finding the Fourth Proportional to 28,670.50, 39,518.91 and 21,390.22

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Solution

The fourth proportional to 28,670.50, 39,518.91 and 21,390.22 is: 29,483.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,670.50 : 39,518.91 = 21,390.22 : x
  2. Step 2: Convert to fraction form
    28,670.50/39,518.91 = 21,390.22/x
  3. Step 3: Cross multiply
    28,670.50x = 39,518.91 × 21,390.22
  4. Step 4: Simplify right side
    28,670.50x = 845,318,080.26
  5. Step 5: Solve for x
    x = 845,318,080.26/28,670.50
  6. Step 6: Final answer
    x = 29,483.90

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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.