Home / 1,215.15-1,677.14-790.30

Finding the Fourth Proportional to 1,215.15, 1,677.14 and 790.30

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Solution

The fourth proportional to 1,215.15, 1,677.14 and 790.30 is: 1,090.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.15 : 1,677.14 = 790.30 : x
  2. Step 2: Convert to fraction form
    1,215.15/1,677.14 = 790.30/x
  3. Step 3: Cross multiply
    1,215.15x = 1,677.14 × 790.30
  4. Step 4: Simplify right side
    1,215.15x = 1,325,445.72
  5. Step 5: Solve for x
    x = 1,325,445.72/1,215.15
  6. Step 6: Final answer
    x = 1,090.77

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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.