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Finding the Fourth Proportional to 1,393.08, 2,089.62 and 815.16

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Solution

The fourth proportional to 1,393.08, 2,089.62 and 815.16 is: 1,222.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.08 : 2,089.62 = 815.16 : x
  2. Step 2: Convert to fraction form
    1,393.08/2,089.62 = 815.16/x
  3. Step 3: Cross multiply
    1,393.08x = 2,089.62 × 815.16
  4. Step 4: Simplify right side
    1,393.08x = 1,703,374.64
  5. Step 5: Solve for x
    x = 1,703,374.64/1,393.08
  6. Step 6: Final answer
    x = 1,222.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.