Home / 1,561.20-2,153.77-1,029.40

Finding the Fourth Proportional to 1,561.20, 2,153.77 and 1,029.40

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Solution

The fourth proportional to 1,561.20, 2,153.77 and 1,029.40 is: 1,420.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.20 : 2,153.77 = 1,029.40 : x
  2. Step 2: Convert to fraction form
    1,561.20/2,153.77 = 1,029.40/x
  3. Step 3: Cross multiply
    1,561.20x = 2,153.77 × 1,029.40
  4. Step 4: Simplify right side
    1,561.20x = 2,217,088.67
  5. Step 5: Solve for x
    x = 2,217,088.67/1,561.20
  6. Step 6: Final answer
    x = 1,420.12

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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.