Home / 20,686.78-28,539.30-14,402.80

Finding the Fourth Proportional to 20,686.78, 28,539.30 and 14,402.80

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Solution

The fourth proportional to 20,686.78, 28,539.30 and 14,402.80 is: 19,869.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,686.78 : 28,539.30 = 14,402.80 : x
  2. Step 2: Convert to fraction form
    20,686.78/28,539.30 = 14,402.80/x
  3. Step 3: Cross multiply
    20,686.78x = 28,539.30 × 14,402.80
  4. Step 4: Simplify right side
    20,686.78x = 411,045,830.04
  5. Step 5: Solve for x
    x = 411,045,830.04/20,686.78
  6. Step 6: Final answer
    x = 19,869.98

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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.