Home / 1,421.18-2,128.93-1,129.18

Finding the Fourth Proportional to 1,421.18, 2,128.93 and 1,129.18

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Solution

The fourth proportional to 1,421.18, 2,128.93 and 1,129.18 is: 1,691.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.18 : 2,128.93 = 1,129.18 : x
  2. Step 2: Convert to fraction form
    1,421.18/2,128.93 = 1,129.18/x
  3. Step 3: Cross multiply
    1,421.18x = 2,128.93 × 1,129.18
  4. Step 4: Simplify right side
    1,421.18x = 2,403,937.03
  5. Step 5: Solve for x
    x = 2,403,937.03/1,421.18
  6. Step 6: Final answer
    x = 1,691.50

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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.