Home / 31,088.24-42,908.40-20,478.80

Finding the Fourth Proportional to 31,088.24, 42,908.40 and 20,478.80

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Solution

The fourth proportional to 31,088.24, 42,908.40 and 20,478.80 is: 28,265.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,088.24 : 42,908.40 = 20,478.80 : x
  2. Step 2: Convert to fraction form
    31,088.24/42,908.40 = 20,478.80/x
  3. Step 3: Cross multiply
    31,088.24x = 42,908.40 × 20,478.80
  4. Step 4: Simplify right side
    31,088.24x = 878,712,541.92
  5. Step 5: Solve for x
    x = 878,712,541.92/31,088.24
  6. Step 6: Final answer
    x = 28,265.11

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.