Home / 1,417.90-2,126.85-1,320.70

Finding the Fourth Proportional to 1,417.90, 2,126.85 and 1,320.70

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Solution

The fourth proportional to 1,417.90, 2,126.85 and 1,320.70 is: 1,981.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,417.90 : 2,126.85 = 1,320.70 : x
  2. Step 2: Convert to fraction form
    1,417.90/2,126.85 = 1,320.70/x
  3. Step 3: Cross multiply
    1,417.90x = 2,126.85 × 1,320.70
  4. Step 4: Simplify right side
    1,417.90x = 2,808,930.80
  5. Step 5: Solve for x
    x = 2,808,930.80/1,417.90
  6. Step 6: Final answer
    x = 1,981.05

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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.