Home / 1,420.90-2,139.73-1,240.47

Finding the Fourth Proportional to 1,420.90, 2,139.73 and 1,240.47

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Solution

The fourth proportional to 1,420.90, 2,139.73 and 1,240.47 is: 1,868.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.90 : 2,139.73 = 1,240.47 : x
  2. Step 2: Convert to fraction form
    1,420.90/2,139.73 = 1,240.47/x
  3. Step 3: Cross multiply
    1,420.90x = 2,139.73 × 1,240.47
  4. Step 4: Simplify right side
    1,420.90x = 2,654,267.77
  5. Step 5: Solve for x
    x = 2,654,267.77/1,420.90
  6. Step 6: Final answer
    x = 1,868.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.