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Finding the Fourth Proportional to 1,430.90, 2,147.70 and 1,225.70

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Solution

The fourth proportional to 1,430.90, 2,147.70 and 1,225.70 is: 1,839.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,430.90 : 2,147.70 = 1,225.70 : x
  2. Step 2: Convert to fraction form
    1,430.90/2,147.70 = 1,225.70/x
  3. Step 3: Cross multiply
    1,430.90x = 2,147.70 × 1,225.70
  4. Step 4: Simplify right side
    1,430.90x = 2,632,435.89
  5. Step 5: Solve for x
    x = 2,632,435.89/1,430.90
  6. Step 6: Final answer
    x = 1,839.71

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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.