Home / 2,312.80-3,188.37-1,428.01

Finding the Fourth Proportional to 2,312.80, 3,188.37 and 1,428.01

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Solution

The fourth proportional to 2,312.80, 3,188.37 and 1,428.01 is: 1,968.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,312.80 : 3,188.37 = 1,428.01 : x
  2. Step 2: Convert to fraction form
    2,312.80/3,188.37 = 1,428.01/x
  3. Step 3: Cross multiply
    2,312.80x = 3,188.37 × 1,428.01
  4. Step 4: Simplify right side
    2,312.80x = 4,553,024.24
  5. Step 5: Solve for x
    x = 4,553,024.24/2,312.80
  6. Step 6: Final answer
    x = 1,968.62

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Why These Related Problems?

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