Home / 1,445.18-1,994.24-815.66

Finding the Fourth Proportional to 1,445.18, 1,994.24 and 815.66

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Solution

The fourth proportional to 1,445.18, 1,994.24 and 815.66 is: 1,125.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,445.18 : 1,994.24 = 815.66 : x
  2. Step 2: Convert to fraction form
    1,445.18/1,994.24 = 815.66/x
  3. Step 3: Cross multiply
    1,445.18x = 1,994.24 × 815.66
  4. Step 4: Simplify right side
    1,445.18x = 1,626,621.80
  5. Step 5: Solve for x
    x = 1,626,621.80/1,445.18
  6. Step 6: Final answer
    x = 1,125.55

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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.