Home / 1,420.40-1,957.56-1,400.24

Finding the Fourth Proportional to 1,420.40, 1,957.56 and 1,400.24

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Solution

The fourth proportional to 1,420.40, 1,957.56 and 1,400.24 is: 1,929.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.40 : 1,957.56 = 1,400.24 : x
  2. Step 2: Convert to fraction form
    1,420.40/1,957.56 = 1,400.24/x
  3. Step 3: Cross multiply
    1,420.40x = 1,957.56 × 1,400.24
  4. Step 4: Simplify right side
    1,420.40x = 2,741,053.81
  5. Step 5: Solve for x
    x = 2,741,053.81/1,420.40
  6. Step 6: Final answer
    x = 1,929.78

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1.5x scale

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.