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Finding the Fourth Proportional to 28,657.31, 42,980.27 and 14,421.99

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Solution

The fourth proportional to 28,657.31, 42,980.27 and 14,421.99 is: 21,630.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,657.31 : 42,980.27 = 14,421.99 : x
  2. Step 2: Convert to fraction form
    28,657.31/42,980.27 = 14,421.99/x
  3. Step 3: Cross multiply
    28,657.31x = 42,980.27 × 14,421.99
  4. Step 4: Simplify right side
    28,657.31x = 619,860,952.03
  5. Step 5: Solve for x
    x = 619,860,952.03/28,657.31
  6. Step 6: Final answer
    x = 21,630.12

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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.