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Finding the Fourth Proportional to 28,442.88, 42,664.32 and 9,970.56

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Solution

The fourth proportional to 28,442.88, 42,664.32 and 9,970.56 is: 14,955.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,442.88 : 42,664.32 = 9,970.56 : x
  2. Step 2: Convert to fraction form
    28,442.88/42,664.32 = 9,970.56/x
  3. Step 3: Cross multiply
    28,442.88x = 42,664.32 × 9,970.56
  4. Step 4: Simplify right side
    28,442.88x = 425,387,162.42
  5. Step 5: Solve for x
    x = 425,387,162.42/28,442.88
  6. Step 6: Final answer
    x = 14,955.84

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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.