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Finding the Fourth Proportional to 28,435.78, 42,621.90 and 10,649.32

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Solution

The fourth proportional to 28,435.78, 42,621.90 and 10,649.32 is: 15,962.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,435.78 : 42,621.90 = 10,649.32 : x
  2. Step 2: Convert to fraction form
    28,435.78/42,621.90 = 10,649.32/x
  3. Step 3: Cross multiply
    28,435.78x = 42,621.90 × 10,649.32
  4. Step 4: Simplify right side
    28,435.78x = 453,894,345.37
  5. Step 5: Solve for x
    x = 453,894,345.37/28,435.78
  6. Step 6: Final answer
    x = 15,962.08

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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.