Home / 1,445.76-1,990.56-1,248.96

Finding the Fourth Proportional to 1,445.76, 1,990.56 and 1,248.96

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Solution

The fourth proportional to 1,445.76, 1,990.56 and 1,248.96 is: 1,719.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,445.76 : 1,990.56 = 1,248.96 : x
  2. Step 2: Convert to fraction form
    1,445.76/1,990.56 = 1,248.96/x
  3. Step 3: Cross multiply
    1,445.76x = 1,990.56 × 1,248.96
  4. Step 4: Simplify right side
    1,445.76x = 2,486,129.82
  5. Step 5: Solve for x
    x = 2,486,129.82/1,445.76
  6. Step 6: Final answer
    x = 1,719.60

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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.