Home / 1,420.20-1,959.90-790.77

Finding the Fourth Proportional to 1,420.20, 1,959.90 and 790.77

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Solution

The fourth proportional to 1,420.20, 1,959.90 and 790.77 is: 1,091.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.20 : 1,959.90 = 790.77 : x
  2. Step 2: Convert to fraction form
    1,420.20/1,959.90 = 790.77/x
  3. Step 3: Cross multiply
    1,420.20x = 1,959.90 × 790.77
  4. Step 4: Simplify right side
    1,420.20x = 1,549,830.12
  5. Step 5: Solve for x
    x = 1,549,830.12/1,420.20
  6. Step 6: Final answer
    x = 1,091.28

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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.