Home / 42,778.08-64,143.63-13,187.70

Finding the Fourth Proportional to 42,778.08, 64,143.63 and 13,187.70

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Solution

The fourth proportional to 42,778.08, 64,143.63 and 13,187.70 is: 19,774.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,778.08 : 64,143.63 = 13,187.70 : x
  2. Step 2: Convert to fraction form
    42,778.08/64,143.63 = 13,187.70/x
  3. Step 3: Cross multiply
    42,778.08x = 64,143.63 × 13,187.70
  4. Step 4: Simplify right side
    42,778.08x = 845,906,949.35
  5. Step 5: Solve for x
    x = 845,906,949.35/42,778.08
  6. Step 6: Final answer
    x = 19,774.31

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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.