Home / 1,571.28-2,345.40-1,386.78

Finding the Fourth Proportional to 1,571.28, 2,345.40 and 1,386.78

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Solution

The fourth proportional to 1,571.28, 2,345.40 and 1,386.78 is: 2,070.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,571.28 : 2,345.40 = 1,386.78 : x
  2. Step 2: Convert to fraction form
    1,571.28/2,345.40 = 1,386.78/x
  3. Step 3: Cross multiply
    1,571.28x = 2,345.40 × 1,386.78
  4. Step 4: Simplify right side
    1,571.28x = 3,252,553.81
  5. Step 5: Solve for x
    x = 3,252,553.81/1,571.28
  6. Step 6: Final answer
    x = 2,070.00

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.