Home / 42,939.80-64,407-13,355.36

Finding the Fourth Proportional to 42,939.80, 64,407 and 13,355.36

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Solution

The fourth proportional to 42,939.80, 64,407 and 13,355.36 is: 20,032.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,939.80 : 64,407 = 13,355.36 : x
  2. Step 2: Convert to fraction form
    42,939.80/64,407 = 13,355.36/x
  3. Step 3: Cross multiply
    42,939.80x = 64,407 × 13,355.36
  4. Step 4: Simplify right side
    42,939.80x = 860,178,671.52
  5. Step 5: Solve for x
    x = 860,178,671.52/42,939.80
  6. Step 6: Final answer
    x = 20,032.20

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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.