Home / 42,859.89-64,331.39-20,688.86

Finding the Fourth Proportional to 42,859.89, 64,331.39 and 20,688.86

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Solution

The fourth proportional to 42,859.89, 64,331.39 and 20,688.86 is: 31,053.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,859.89 : 64,331.39 = 20,688.86 : x
  2. Step 2: Convert to fraction form
    42,859.89/64,331.39 = 20,688.86/x
  3. Step 3: Cross multiply
    42,859.89x = 64,331.39 × 20,688.86
  4. Step 4: Simplify right side
    42,859.89x = 1,330,943,333.87
  5. Step 5: Solve for x
    x = 1,330,943,333.87/42,859.89
  6. Step 6: Final answer
    x = 31,053.35

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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.