Home / 1,392.06-1,921.95-1,130.70

Finding the Fourth Proportional to 1,392.06, 1,921.95 and 1,130.70

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Solution

The fourth proportional to 1,392.06, 1,921.95 and 1,130.70 is: 1,561.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.06 : 1,921.95 = 1,130.70 : x
  2. Step 2: Convert to fraction form
    1,392.06/1,921.95 = 1,130.70/x
  3. Step 3: Cross multiply
    1,392.06x = 1,921.95 × 1,130.70
  4. Step 4: Simplify right side
    1,392.06x = 2,173,148.87
  5. Step 5: Solve for x
    x = 2,173,148.87/1,392.06
  6. Step 6: Final answer
    x = 1,561.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.