Home / 1,561.47-2,154.38-971.79

Finding the Fourth Proportional to 1,561.47, 2,154.38 and 971.79

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Solution

The fourth proportional to 1,561.47, 2,154.38 and 971.79 is: 1,340.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.47 : 2,154.38 = 971.79 : x
  2. Step 2: Convert to fraction form
    1,561.47/2,154.38 = 971.79/x
  3. Step 3: Cross multiply
    1,561.47x = 2,154.38 × 971.79
  4. Step 4: Simplify right side
    1,561.47x = 2,093,600.08
  5. Step 5: Solve for x
    x = 2,093,600.08/1,561.47
  6. Step 6: Final answer
    x = 1,340.79

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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.