Home / 1,415.40-2,117.10-1,270.20

Finding the Fourth Proportional to 1,415.40, 2,117.10 and 1,270.20

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Solution

The fourth proportional to 1,415.40, 2,117.10 and 1,270.20 is: 1,899.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.40 : 2,117.10 = 1,270.20 : x
  2. Step 2: Convert to fraction form
    1,415.40/2,117.10 = 1,270.20/x
  3. Step 3: Cross multiply
    1,415.40x = 2,117.10 × 1,270.20
  4. Step 4: Simplify right side
    1,415.40x = 2,689,140.42
  5. Step 5: Solve for x
    x = 2,689,140.42/1,415.40
  6. Step 6: Final answer
    x = 1,899.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.