Home / 1,225.20-1,837.80-1,124.40

Finding the Fourth Proportional to 1,225.20, 1,837.80 and 1,124.40

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Solution

The fourth proportional to 1,225.20, 1,837.80 and 1,124.40 is: 1,686.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.20 : 1,837.80 = 1,124.40 : x
  2. Step 2: Convert to fraction form
    1,225.20/1,837.80 = 1,124.40/x
  3. Step 3: Cross multiply
    1,225.20x = 1,837.80 × 1,124.40
  4. Step 4: Simplify right side
    1,225.20x = 2,066,422.32
  5. Step 5: Solve for x
    x = 2,066,422.32/1,225.20
  6. Step 6: Final answer
    x = 1,686.60

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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.